Uses of Class
java.lang.Object

Packages that use Object

Package	Description
java.beans
java.io
java.lang
java.lang.annotation
java.lang.invoke
java.lang.ref	Provides reference-object classes, which support a limited degree of interaction with the garbage collector.
java.lang.reflect	Provides classes and interfaces for obtaining reflective information about classes and objects.
java.math	Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
java.net
java.nio
java.nio.charset
java.security
java.text
java.util
java.util.concurrent	Utility classes commonly useful in concurrent programming.
java.util.concurrent.atomic	A small toolkit of classes that support lock-free thread-safe programming on single variables.
java.util.concurrent.locks	Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.
java.util.function	Functional interfaces provide target types for lambda expressions and method references.
java.util.logging
java.util.regex	Classes for matching character sequences against patterns specified by regular expressions.
java.util.stream	Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
javax.annotation.processing
org.apidesign.bck2brwsr.launcher.b2b
org.apidesign.bck2brwsr.launcher.impl
org.apidesign.vm4brwsr
org.apidesign.vm4brwsr.api
org.netbeans.modules.openide.util
org.openide.util	Client API part of the Lookup interfaces.
org.openide.util.lookup	Support classes for the Registration and Lookup extension mechanism.
org.openide.util.lookup.implspi	Interfaces intended to be used within the NetBeans Platform.

Uses of Object in java.beans

Subclasses of Object in java.beans

Modifier and Type	Class and Description
class	IndexedPropertyChangeEvent An "IndexedPropertyChange" event gets delivered whenever a component that conforms to the JavaBeans™ specification (a "bean") changes a bound indexed property.
class	PropertyChangeEvent A "PropertyChange" event gets delivered whenever a bean changes a "bound" or "constrained" property.
class	PropertyChangeListenerProxy A class which extends the EventListenerProxy specifically for adding a PropertyChangeListener with a "bound" property.
class	PropertyChangeSupport This is a utility class that can be used by beans that support bound properties.
class	PropertyVetoException A PropertyVetoException is thrown when a proposed change to a property represents an unacceptable value.
class	VetoableChangeListenerProxy A class which extends the EventListenerProxy specifically for adding a VetoableChangeListener with a "constrained" property.
class	VetoableChangeSupport This is a utility class that can be used by beans that support constrained properties.

Methods in java.beans that return Object

Modifier and Type	Method and Description
Object	PropertyChangeEvent.getNewValue() Gets the new value for the property, expressed as an Object.
Object	PropertyChangeEvent.getOldValue() Gets the old value for the property, expressed as an Object.
Object	PropertyChangeEvent.getPropagationId() The "propagationId" field is reserved for future use.

Methods in java.beans with parameters of type Object

Modifier and Type	Method and Description
void	PropertyChangeSupport.fireIndexedPropertyChange(String propertyName, int index, Object oldValue, Object newValue) Reports a bound indexed property update to listeners that have been registered to track updates of all properties or a property with the specified name.
void	PropertyChangeSupport.firePropertyChange(String propertyName, Object oldValue, Object newValue) Reports a bound property update to listeners that have been registered to track updates of all properties or a property with the specified name.
void	VetoableChangeSupport.fireVetoableChange(String propertyName, Object oldValue, Object newValue) Reports a constrained property update to listeners that have been registered to track updates of all properties or a property with the specified name.
void	PropertyChangeEvent.setPropagationId(Object propagationId) Sets the propagationId object for the event.

Constructors in java.beans with parameters of type Object

Constructor and Description
IndexedPropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue, int index) Constructs a new IndexedPropertyChangeEvent object.
PropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue) Constructs a new PropertyChangeEvent.
PropertyChangeSupport(Object sourceBean) Constructs a PropertyChangeSupport object.
VetoableChangeSupport(Object sourceBean) Constructs a VetoableChangeSupport object.

Uses of Object in java.io

Subclasses of Object in java.io

Modifier and Type	Class and Description
class	BufferedInputStream A BufferedInputStream adds functionality to another input stream-namely, the ability to buffer the input and to support the mark and reset methods.
class	BufferedOutputStream The class implements a buffered output stream.
class	BufferedReader Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.
class	BufferedWriter Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
class	ByteArrayInputStream A ByteArrayInputStream contains an internal buffer that contains bytes that may be read from the stream.
class	ByteArrayOutputStream This class implements an output stream in which the data is written into a byte array.
class	DataInputStream A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
class	DataOutputStream A data output stream lets an application write primitive Java data types to an output stream in a portable way.
class	EOFException Signals that an end of file or end of stream has been reached unexpectedly during input.
class	File An abstract representation of file and directory pathnames.
class	FileDescriptor Instances of the file descriptor class serve as an opaque handle to the underlying machine-specific structure representing an open file, an open socket, or another source or sink of bytes.
class	FileInputStream A FileInputStream obtains input bytes from a file in a file system.
class	FileNotFoundException Signals that an attempt to open the file denoted by a specified pathname has failed.
class	FileOutputStream A file output stream is an output stream for writing data to a File or to a FileDescriptor.
class	FileReader Convenience class for reading character files.
class	FileWriter Convenience class for writing character files.
class	FilterInputStream A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
class	FilterOutputStream This class is the superclass of all classes that filter output streams.
class	FilterReader Abstract class for reading filtered character streams.
class	FilterWriter Abstract class for writing filtered character streams.
class	InputStream This abstract class is the superclass of all classes representing an input stream of bytes.
class	InputStreamReader An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset.
class	InterruptedIOException Signals that an I/O operation has been interrupted.
class	InvalidClassException Thrown when the Serialization runtime detects one of the following problems with a Class.
class	InvalidObjectException Indicates that one or more deserialized objects failed validation tests.
class	IOException Signals that an I/O exception of some sort has occurred.
class	LineNumberInputStream Deprecated. This class incorrectly assumes that bytes adequately represent characters. As of JDK 1.1, the preferred way to operate on character streams is via the new character-stream classes, which include a class for counting line numbers.
class	LineNumberReader A buffered character-input stream that keeps track of line numbers.
class	NotActiveException Thrown when serialization or deserialization is not active.
class	NotSerializableException Thrown when an instance is required to have a Serializable interface.
class	ObjectInputStream An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream.
static class	ObjectInputStream.GetField Provide access to the persistent fields read from the input stream.
class	ObjectOutputStream An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.
static class	ObjectOutputStream.PutField Provide programmatic access to the persistent fields to be written to ObjectOutput.
class	ObjectStreamClass Serialization's descriptor for classes.
class	ObjectStreamException Superclass of all exceptions specific to Object Stream classes.
class	ObjectStreamField A description of a Serializable field from a Serializable class.
class	OptionalDataException Exception indicating the failure of an object read operation due to unread primitive data, or the end of data belonging to a serialized object in the stream.
class	OutputStream This abstract class is the superclass of all classes representing an output stream of bytes.
class	OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified charset.
class	PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
class	PrintWriter Prints formatted representations of objects to a text-output stream.
class	PushbackInputStream A PushbackInputStream adds functionality to another input stream, namely the ability to "push back" or "unread" one byte.
class	Reader Abstract class for reading character streams.
class	StreamCorruptedException Thrown when control information that was read from an object stream violates internal consistency checks.
class	StringReader A character stream whose source is a string.
class	StringWriter A character stream that collects its output in a string buffer, which can then be used to construct a string.
class	SyncFailedException Signals that a sync operation has failed.
class	UnsupportedEncodingException The Character Encoding is not supported.
class	UTFDataFormatException Signals that a malformed string in modified UTF-8 format has been read in a data input stream or by any class that implements the data input interface.
class	WriteAbortedException Signals that one of the ObjectStreamExceptions was thrown during a write operation.
class	Writer Abstract class for writing to character streams.

Fields in java.io declared as Object

Modifier and Type	Field and Description
protected Object	Writer.lock The object used to synchronize operations on this stream.
protected Object	Reader.lock The object used to synchronize operations on this stream.

Methods in java.io that return Object

Modifier and Type	Method and Description
abstract Object	ObjectInputStream.GetField.get(String name, Object val) Get the value of the named Object field from the persistent field.
Object	ObjectInputStream.readObject() Read an object from the ObjectInputStream.
Object	ObjectInput.readObject() Read and return an object.
protected Object	ObjectInputStream.readObjectOverride() This method is called by trusted subclasses of ObjectOutputStream that constructed ObjectOutputStream using the protected no-arg constructor.
Object	ObjectInputStream.readUnshared() Reads an "unshared" object from the ObjectInputStream.
protected Object	ObjectOutputStream.replaceObject(Object obj) This method will allow trusted subclasses of ObjectOutputStream to substitute one object for another during serialization.
protected Object	ObjectInputStream.resolveObject(Object obj) This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization.

Methods in java.io with parameters of type Object

Modifier and Type	Method and Description
int	ObjectStreamField.compareTo(Object obj) Compare this field with another ObjectStreamField.
boolean	File.equals(Object obj) Tests this abstract pathname for equality with the given object.
PrintWriter	PrintWriter.format(String format, Object... args) Writes a formatted string to this writer using the specified format string and arguments.
abstract Object	ObjectInputStream.GetField.get(String name, Object val) Get the value of the named Object field from the persistent field.
void	PrintWriter.print(Object obj) Prints an object.
void	PrintStream.print(Object obj) Prints an object.
PrintWriter	PrintWriter.printf(String format, Object... args) A convenience method to write a formatted string to this writer using the specified format string and arguments.
PrintStream	PrintStream.printf(String format, Object... args) A convenience method to write a formatted string to this output stream using the specified format string and arguments.
void	PrintWriter.println(Object x) Prints an Object and then terminates the line.
void	PrintStream.println(Object x) Prints an Object and then terminate the line.
abstract void	ObjectOutputStream.PutField.put(String name, Object val) Put the value of the named Object field into the persistent field.
protected Object	ObjectOutputStream.replaceObject(Object obj) This method will allow trusted subclasses of ObjectOutputStream to substitute one object for another during serialization.
protected Object	ObjectInputStream.resolveObject(Object obj) This method will allow trusted subclasses of ObjectInputStream to substitute one object for another during deserialization.
void	ObjectOutputStream.writeObject(Object obj) Write the specified object to the ObjectOutputStream.
void	ObjectOutput.writeObject(Object obj) Write an object to the underlying storage or stream.
protected void	ObjectOutputStream.writeObjectOverride(Object obj) Method used by subclasses to override the default writeObject method.
void	ObjectOutputStream.writeUnshared(Object obj) Writes an "unshared" object to the ObjectOutputStream.

Constructors in java.io with parameters of type Object

Constructor and Description
Reader(Object lock) Creates a new character-stream reader whose critical sections will synchronize on the given object.
Writer(Object lock) Creates a new character-stream writer whose critical sections will synchronize on the given object.

Uses of Object in java.lang

Subclasses of Object in java.lang

Modifier and Type	Class and Description
class	AbstractMethodError Thrown when an application tries to call an abstract method.
class	ArithmeticException Thrown when an exceptional arithmetic condition has occurred.
class	ArrayIndexOutOfBoundsException Thrown to indicate that an array has been accessed with an illegal index.
class	ArrayStoreException Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.
class	AssertionError Thrown to indicate that an assertion has failed.
class	Boolean The Boolean class wraps a value of the primitive type boolean in an object.
class	Byte The Byte class wraps a value of primitive type byte in an object.
class	Character The Character class wraps a value of the primitive type char in an object.
static class	Character.Subset Instances of this class represent particular subsets of the Unicode character set.
class	Class<T> Instances of the class Class represent classes and interfaces in a running Java application.
class	ClassCastException Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.
class	ClassFormatError Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.
class	ClassLoader A class loader is an object that is responsible for loading classes.
class	ClassNotFoundException Thrown when an application tries to load in a class through its string name using: The forName method in class Class.
class	ClassValue<T> Lazily associate a computed value with (potentially) every type.
class	CloneNotSupportedException Thrown to indicate that the clone method in class Object has been called to clone an object, but that the object's class does not implement the Cloneable interface.
class	Double The Double class wraps a value of the primitive type double in an object.
class	Enum<E extends Enum<E>> This is the common base class of all Java language enumeration types.
class	Error An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.
class	Exception The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.
class	Float The Float class wraps a value of primitive type float in an object.
class	IllegalAccessError Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.
class	IllegalAccessException An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.
class	IllegalArgumentException Thrown to indicate that a method has been passed an illegal or inappropriate argument.
class	IllegalMonitorStateException Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other threads waiting on an object's monitor without owning the specified monitor.
class	IllegalStateException Signals that a method has been invoked at an illegal or inappropriate time.
class	IncompatibleClassChangeError Thrown when an incompatible class change has occurred to some class definition.
class	IndexOutOfBoundsException Thrown to indicate that an index of some sort (such as to an array, to a string, or to a vector) is out of range.
class	InstantiationException Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated.
class	Integer The Integer class wraps a value of the primitive type int in an object.
class	InternalError Thrown to indicate some unexpected internal error has occurred in the Java Virtual Machine.
class	InterruptedException Thrown when a thread is waiting, sleeping, or otherwise occupied, and the thread is interrupted, either before or during the activity.
class	LinkageError Subclasses of LinkageError indicate that a class has some dependency on another class; however, the latter class has incompatibly changed after the compilation of the former class.
class	Long The Long class wraps a value of the primitive type long in an object.
class	Math The class Math contains methods for performing basic numeric operations such as the elementary exponential, logarithm, square root, and trigonometric functions.
class	NegativeArraySizeException Thrown if an application tries to create an array with negative size.
class	NoSuchFieldError Thrown if an application tries to access or modify a specified field of an object, and that object no longer has that field.
class	NoSuchMethodError Thrown if an application tries to call a specified method of a class (either static or instance), and that class no longer has a definition of that method.
class	NoSuchMethodException Thrown when a particular method cannot be found.
class	NullPointerException Thrown when an application attempts to use null in a case where an object is required.
class	Number The abstract class Number is the superclass of classes BigDecimal, BigInteger, Byte, Double, Float, Integer, Long, and Short.
class	NumberFormatException Thrown to indicate that the application has attempted to convert a string to one of the numeric types, but that the string does not have the appropriate format.
class	OutOfMemoryError Thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.
class	Package Package objects contain version information about the implementation and specification of a Java package.
class	ReflectiveOperationException Common superclass of exceptions thrown by reflective operations in core reflection.
class	RuntimeException RuntimeException is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.
class	SecurityException Thrown by the security manager to indicate a security violation.
class	Short The Short class wraps a value of primitive type short in an object.
class	StackOverflowError Thrown when a stack overflow occurs because an application recurses too deeply.
class	StackTraceElement An element in a stack trace, as returned by Throwable.getStackTrace().
class	String The String class represents character strings.
class	StringBuffer A thread-safe, mutable sequence of characters.
class	StringBuilder A mutable sequence of characters.
class	StringIndexOutOfBoundsException Thrown by String methods to indicate that an index is either negative or greater than the size of the string.
class	System Poor man's re-implementation of most important System methods.
class	Thread A thread is a thread of execution in a program.
class	ThreadLocal<T> This class provides thread-local variables.
class	Throwable The Throwable class is the superclass of all errors and exceptions in the Java language.
class	UnsupportedOperationException Thrown to indicate that the requested operation is not supported.
class	VirtualMachineError Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.
class	Void The Void class is an uninstantiable placeholder class to hold a reference to the Class object representing the Java keyword void.

Methods in java.lang that return Object

Modifier and Type	Method and Description
protected Object	Thread.clone() Throws CloneNotSupportedException as a Thread can not be meaningfully cloned.
protected Object	Object.clone() Creates and returns a copy of this object.
protected Object	Enum.clone() Throws CloneNotSupportedException.
protected Object	ClassLoader.getClassLoadingLock(String className) Returns the lock object for class loading operations.

Methods in java.lang with parameters of type Object

Modifier and Type	Method and Description
StringBuilder	StringBuilder.append(Object obj)
StringBuffer	StringBuffer.append(Object obj)
static void	System.arraycopy(Object value, int srcBegin, Object dst, int dstBegin, int count)
T	Class.cast(Object obj) Casts an object to the class or interface represented by this Class object.
boolean	String.equals(Object anObject) Compares this string to the specified object.
boolean	StackTraceElement.equals(Object obj) Returns true if the specified object is another StackTraceElement instance representing the same execution point as this instance.
boolean	Short.equals(Object obj) Compares this object to the specified object.
boolean	Object.equals(Object obj) Indicates whether some other object is "equal to" this one.
boolean	Long.equals(Object obj) Compares this object to the specified object.
boolean	Integer.equals(Object obj) Compares this object to the specified object.
boolean	Float.equals(Object obj) Compares this object against the specified object.
boolean	Enum.equals(Object other) Returns true if the specified object is equal to this enum constant.
boolean	Double.equals(Object obj) Compares this object against the specified object.
boolean	Class.equals(Object obj)
boolean	Character.equals(Object obj) Compares this object against the specified object.
boolean	Character.Subset.equals(Object obj) Compares two Subset objects for equality.
boolean	Byte.equals(Object obj) Compares this object to the specified object.
boolean	Boolean.equals(Object obj) Returns true if and only if the argument is not null and is a Boolean object that represents the same boolean value as this object.
static String	String.format(Locale l, String format, Object... args) Returns a formatted string using the specified locale, format string, and arguments.
static String	String.format(String format, Object... args) Returns a formatted string using the specified format string and arguments.
static boolean	Thread.holdsLock(Object obj) Returns true if and only if the current thread holds the monitor lock on the specified object.
static int	System.identityHashCode(Object obj)
StringBuilder	StringBuilder.insert(int offset, Object obj)
StringBuffer	StringBuffer.insert(int offset, Object obj)
boolean	Class.isInstance(Object obj) Determines if the specified Object is assignment-compatible with the object represented by this Class.
protected void	ClassLoader.setSigners(Class<?> c, Object[] signers) Sets the signers of a class.
static String	String.valueOf(Object obj) Returns the string representation of the Object argument.

Constructors in java.lang with parameters of type Object

Constructor and Description
AssertionError(Object detailMessage) Constructs an AssertionError with its detail message derived from the specified object, which is converted to a string as defined in section 15.18.1.1 of The Java™ Language Specification.

Uses of Object in java.lang.annotation

Subclasses of Object in java.lang.annotation

Modifier and Type	Class and Description
class	AnnotationFormatError Thrown when the annotation parser attempts to read an annotation from a class file and determines that the annotation is malformed.
class	AnnotationTypeMismatchException Thrown to indicate that a program has attempted to access an element of an annotation whose type has changed after the annotation was compiled (or serialized).
class	IncompleteAnnotationException Thrown to indicate that a program has attempted to access an element of an annotation type that was added to the annotation type definition after the annotation was compiled (or serialized).

Methods in java.lang.annotation with parameters of type Object

Modifier and Type	Method and Description
boolean	Annotation.equals(Object obj) Returns true if the specified object represents an annotation that is logically equivalent to this one.

Uses of Object in java.lang.invoke

Subclasses of Object in java.lang.invoke

Modifier and Type	Class and Description
class	CallSite A CallSite is a holder for a variable MethodHandle, which is called its target.
class	LambdaMetafactory Methods to facilitate the creation of simple "function objects" that implement one or more interfaces by delegation to a provided MethodHandle, possibly after type adaptation and partial evaluation of arguments.
class	MethodHandle A method handle is a typed, directly executable reference to an underlying method, constructor, field, or similar low-level operation, with optional transformations of arguments or return values.
class	MethodHandles This class consists exclusively of static methods that operate on or return method handles.
static class	MethodHandles.Lookup A lookup object is a factory for creating method handles, when the creation requires access checking.
class	MethodType A method type represents the arguments and return type accepted and returned by a method handle, or the arguments and return type passed and expected by a method handle caller.
class	SerializedLambda Serialized form of a lambda expression.

Methods in java.lang.invoke that return Object

Modifier and Type	Method and Description
Object	SerializedLambda.getCapturedArg(int i) Get a dynamic argument to the lambda capture site.
Object	MethodHandle.invoke(Object... args) Invokes the method handle, allowing any caller type descriptor, and optionally performing conversions on arguments and return values.
Object	MethodHandle.invokeExact(Object... args) Invokes the method handle, allowing any caller type descriptor, but requiring an exact type match.
Object	MethodHandle.invokeWithArguments(List<?> arguments) Performs a variable arity invocation, passing the arguments in the given array to the method handle, as if via an inexact invoke from a call site which mentions only the type Object, and whose arity is the length of the argument array.
Object	MethodHandle.invokeWithArguments(Object... arguments) Performs a variable arity invocation, passing the arguments in the given list to the method handle, as if via an inexact invoke from a call site which mentions only the type Object, and whose arity is the length of the argument list.

Methods in java.lang.invoke with parameters of type Object

Modifier and Type	Method and Description
static CallSite	LambdaMetafactory.altMetafactory(MethodHandles.Lookup caller, String invokedName, MethodType invokedType, Object... args) Facilitates the creation of simple "function objects" that implement one or more interfaces by delegation to a provided MethodHandle, after appropriate type adaptation and partial evaluation of arguments.
MethodHandle	MethodHandles.Lookup.bind(Object receiver, String name, MethodType type) Produces an early-bound method handle for a non-static method.
MethodHandle	MethodHandle.bindTo(Object x) Binds a value x to the first argument of a method handle, without invoking it.
boolean	MethodType.equals(Object x) Compares the specified object with this type for equality.
Object	MethodHandle.invoke(Object... args) Invokes the method handle, allowing any caller type descriptor, and optionally performing conversions on arguments and return values.
Object	MethodHandle.invokeExact(Object... args) Invokes the method handle, allowing any caller type descriptor, but requiring an exact type match.
Object	MethodHandle.invokeWithArguments(Object... arguments) Performs a variable arity invocation, passing the arguments in the given list to the method handle, as if via an inexact invoke from a call site which mentions only the type Object, and whose arity is the length of the argument list.

Constructors in java.lang.invoke with parameters of type Object

Constructor and Description
SerializedLambda(Class<?> capturingClass, String functionalInterfaceClass, String functionalInterfaceMethodName, String functionalInterfaceMethodSignature, int implMethodKind, String implClass, String implMethodName, String implMethodSignature, String instantiatedMethodType, Object[] capturedArgs) Create a SerializedLambda from the low-level information present at the lambda factory site.

Uses of Object in java.lang.ref

Subclasses of Object in java.lang.ref

Modifier and Type	Class and Description
class	PhantomReference<T> Phantom reference objects, which are enqueued after the collector determines that their referents may otherwise be reclaimed.
class	Reference<T> Abstract base class for reference objects.
class	ReferenceQueue<T> Reference queues, to which registered reference objects are appended by the garbage collector after the appropriate reachability changes are detected.
class	SoftReference<T> Soft reference objects, which are cleared at the discretion of the garbage collector in response to memory demand.
class	WeakReference<T> Weak reference objects, which do not prevent their referents from being made finalizable, finalized, and then reclaimed.

Uses of Object in java.lang.reflect

Subclasses of Object in java.lang.reflect

Modifier and Type	Class and Description
class	AccessibleObject The AccessibleObject class is the base class for Field, Method and Constructor objects.
class	Array The Array class provides static methods to dynamically create and access Java arrays.
class	Constructor<T> Constructor provides information about, and access to, a single constructor for a class.
class	Field A Field provides information about, and dynamic access to, a single field of a class or an interface.
class	InvocationTargetException InvocationTargetException is a checked exception that wraps an exception thrown by an invoked method or constructor.
class	Method A Method provides information about, and access to, a single method on a class or interface.
class	Modifier The Modifier class provides static methods and constants to decode class and member access modifiers.
class	Proxy Proxy provides static methods for creating dynamic proxy classes and instances, and it is also the superclass of all dynamic proxy classes created by those methods.
class	UndeclaredThrowableException Thrown by a method invocation on a proxy instance if its invocation handler's invoke method throws a checked exception (a Throwable that is not assignable to RuntimeException or Error) that is not assignable to any of the exception types declared in the throws clause of the method that was invoked on the proxy instance and dispatched to the invocation handler.

Methods in java.lang.reflect that return Object

Modifier and Type	Method and Description
Object	Field.get(Object obj) Returns the value of the field represented by this Field, on the specified object.
static Object	Array.get(Object array, int index) Returns the value of the indexed component in the specified array object.
Object	Method.getDefaultValue() Returns the default value for the annotation member represented by this Method instance.
Object	InvocationHandler.invoke(Object proxy, Method method, Object[] args) Processes a method invocation on a proxy instance and returns the result.
Object	Method.invoke(Object obj, Object... args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.
static Object	Array.newInstance(Class<?> componentType, int... dimensions) Creates a new array with the specified component type and dimensions.
static Object	Array.newInstance(Class<?> componentType, int length) Creates a new array with the specified component type and length.
static Object	Proxy.newProxyInstance(ClassLoader loader, Class<?>[] interfaces, InvocationHandler h) Returns an instance of a proxy class for the specified interfaces that dispatches method invocations to the specified invocation handler.

Methods in java.lang.reflect with parameters of type Object

Modifier and Type	Method and Description
boolean	Method.equals(Object obj) Compares this Method against the specified object.
boolean	Field.equals(Object obj) Compares this Field against the specified object.
boolean	Constructor.equals(Object obj) Compares this Constructor against the specified object.
Object	Field.get(Object obj) Returns the value of the field represented by this Field, on the specified object.
static Object	Array.get(Object array, int index) Returns the value of the indexed component in the specified array object.
boolean	Field.getBoolean(Object obj) Gets the value of a static or instance boolean field.
static boolean	Array.getBoolean(Object array, int index) Returns the value of the indexed component in the specified array object, as a boolean.
byte	Field.getByte(Object obj) Gets the value of a static or instance byte field.
static byte	Array.getByte(Object array, int index) Returns the value of the indexed component in the specified array object, as a byte.
char	Field.getChar(Object obj) Gets the value of a static or instance field of type char or of another primitive type convertible to type char via a widening conversion.
static char	Array.getChar(Object array, int index) Returns the value of the indexed component in the specified array object, as a char.
double	Field.getDouble(Object obj) Gets the value of a static or instance field of type double or of another primitive type convertible to type double via a widening conversion.
static double	Array.getDouble(Object array, int index) Returns the value of the indexed component in the specified array object, as a double.
float	Field.getFloat(Object obj) Gets the value of a static or instance field of type float or of another primitive type convertible to type float via a widening conversion.
static float	Array.getFloat(Object array, int index) Returns the value of the indexed component in the specified array object, as a float.
int	Field.getInt(Object obj) Gets the value of a static or instance field of type int or of another primitive type convertible to type int via a widening conversion.
static int	Array.getInt(Object array, int index) Returns the value of the indexed component in the specified array object, as an int.
static InvocationHandler	Proxy.getInvocationHandler(Object proxy) Returns the invocation handler for the specified proxy instance.
static int	Array.getLength(Object array) Returns the length of the specified array object, as an int.
long	Field.getLong(Object obj) Gets the value of a static or instance field of type long or of another primitive type convertible to type long via a widening conversion.
static long	Array.getLong(Object array, int index) Returns the value of the indexed component in the specified array object, as a long.
short	Field.getShort(Object obj) Gets the value of a static or instance field of type short or of another primitive type convertible to type short via a widening conversion.
static short	Array.getShort(Object array, int index) Returns the value of the indexed component in the specified array object, as a short.
Object	InvocationHandler.invoke(Object proxy, Method method, Object[] args) Processes a method invocation on a proxy instance and returns the result.
Object	InvocationHandler.invoke(Object proxy, Method method, Object[] args) Processes a method invocation on a proxy instance and returns the result.
Object	Method.invoke(Object obj, Object... args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.
Object	Method.invoke(Object obj, Object... args) Invokes the underlying method represented by this Method object, on the specified object with the specified parameters.
T	Constructor.newInstance(Object... initargs) Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.
static void	Array.set(Object array, int index, Object value) Sets the value of the indexed component of the specified array object to the specified new value.
void	Field.set(Object obj, Object value) Sets the field represented by this Field object on the specified object argument to the specified new value.
void	Field.setBoolean(Object obj, boolean z) Sets the value of a field as a boolean on the specified object.
static void	Array.setBoolean(Object array, int index, boolean z) Sets the value of the indexed component of the specified array object to the specified boolean value.
void	Field.setByte(Object obj, byte b) Sets the value of a field as a byte on the specified object.
static void	Array.setByte(Object array, int index, byte b) Sets the value of the indexed component of the specified array object to the specified byte value.
void	Field.setChar(Object obj, char c) Sets the value of a field as a char on the specified object.
static void	Array.setChar(Object array, int index, char c) Sets the value of the indexed component of the specified array object to the specified char value.
void	Field.setDouble(Object obj, double d) Sets the value of a field as a double on the specified object.
static void	Array.setDouble(Object array, int index, double d) Sets the value of the indexed component of the specified array object to the specified double value.
void	Field.setFloat(Object obj, float f) Sets the value of a field as a float on the specified object.
static void	Array.setFloat(Object array, int index, float f) Sets the value of the indexed component of the specified array object to the specified float value.
void	Field.setInt(Object obj, int i) Sets the value of a field as an int on the specified object.
static void	Array.setInt(Object array, int index, int i) Sets the value of the indexed component of the specified array object to the specified int value.
static void	Array.setLong(Object array, int index, long l) Sets the value of the indexed component of the specified array object to the specified long value.
void	Field.setLong(Object obj, long l) Sets the value of a field as a long on the specified object.
static void	Array.setShort(Object array, int index, short s) Sets the value of the indexed component of the specified array object to the specified short value.
void	Field.setShort(Object obj, short s) Sets the value of a field as a short on the specified object.

Uses of Object in java.math

Subclasses of Object in java.math

Modifier and Type	Class and Description
class	BigDecimal Immutable, arbitrary-precision signed decimal numbers.
class	BigInteger Immutable arbitrary-precision integers.
class	MathContext Immutable objects which encapsulate the context settings which describe certain rules for numerical operators, such as those implemented by the BigDecimal class.

Methods in java.math with parameters of type Object

Modifier and Type	Method and Description
boolean	MathContext.equals(Object x) Compares this MathContext with the specified Object for equality.
boolean	BigInteger.equals(Object x) Compares this BigInteger with the specified Object for equality.
boolean	BigDecimal.equals(Object x) Compares this BigDecimal with the specified Object for equality.

Uses of Object in java.net

Subclasses of Object in java.net

Modifier and Type	Class and Description
class	MalformedURLException Thrown to indicate that a malformed URL has occurred.
class	URI Represents a Uniform Resource Identifier (URI) reference.
class	URISyntaxException Checked exception thrown to indicate that a string could not be parsed as a URI reference.
class	URL Class URL represents a Uniform Resource Locator, a pointer to a "resource" on the World Wide Web.
class	URLConnection The abstract class URLConnection is the superclass of all classes that represent a communications link between the application and a URL.
class	URLStreamHandler The abstract class URLStreamHandler is the common superclass for all stream protocol handlers.

Methods in java.net that return Object

Modifier and Type	Method and Description
Object	URLConnection.getContent() Retrieves the contents of this URL connection.
Object	URL.getContent() Gets the contents of this URL.
Object	URLConnection.getContent(Class[] classes) Retrieves the contents of this URL connection.
Object	URL.getContent(Class[] classes) Gets the contents of this URL.

Methods in java.net with parameters of type Object

Modifier and Type	Method and Description
boolean	URL.equals(Object obj) Compares this URL for equality with another object.
boolean	URI.equals(Object ob) Tests this URI for equality with another object.

Uses of Object in java.nio

Subclasses of Object in java.nio

Modifier and Type	Class and Description
class	CharBuffer

Uses of Object in java.nio.charset

Subclasses of Object in java.nio.charset

Modifier and Type	Class and Description
class	Charset A named mapping between sequences of sixteen-bit Unicode code units and sequences of bytes.
class	CharsetDecoder An engine that can transform a sequence of bytes in a specific charset into a sequence of sixteen-bit Unicode characters.
class	CharsetEncoder An engine that can transform a sequence of sixteen-bit Unicode characters into a sequence of bytes in a specific charset.
class	IllegalCharsetNameException Unchecked exception thrown when a string that is not a legal charset name is used as such.
class	UnsupportedCharsetException Unchecked exception thrown when no support is available for a requested charset.

Methods in java.nio.charset with parameters of type Object

Modifier and Type	Method and Description
boolean	Charset.equals(Object ob) Tells whether or not this object is equal to another.

Uses of Object in java.security

Subclasses of Object in java.security

Modifier and Type	Class and Description
class	AccessControlContext
class	AccessController The AccessController class is used for access control operations and decisions.
class	PrivilegedActionException This exception is thrown by doPrivileged(PrivilegedExceptionAction) and doPrivileged(PrivilegedExceptionAction, AccessControlContext context) to indicate that the action being performed threw a checked exception.

Uses of Object in java.text

Subclasses of Object in java.text

Modifier and Type	Class and Description
class	Annotation An Annotation object is used as a wrapper for a text attribute value if the attribute has annotation characteristics.
static class	AttributedCharacterIterator.Attribute Defines attribute keys that are used to identify text attributes.
class	AttributedString An AttributedString holds text and related attribute information.
class	ChoiceFormat A ChoiceFormat allows you to attach a format to a range of numbers.
class	DateFormat DateFormat is an abstract class for date/time formatting subclasses which formats and parses dates or time in a language-independent manner.
static class	DateFormat.Field Defines constants that are used as attribute keys in the AttributedCharacterIterator returned from DateFormat.formatToCharacterIterator and as field identifiers in FieldPosition.
class	DateFormatSymbols DateFormatSymbols is a public class for encapsulating localizable date-time formatting data, such as the names of the months, the names of the days of the week, and the time zone data.
class	DecimalFormat DecimalFormat is a concrete subclass of NumberFormat that formats decimal numbers.
class	DecimalFormatSymbols This class represents the set of symbols (such as the decimal separator, the grouping separator, and so on) needed by DecimalFormat to format numbers.
class	FieldPosition FieldPosition is a simple class used by Format and its subclasses to identify fields in formatted output.
class	Format Format is an abstract base class for formatting locale-sensitive information such as dates, messages, and numbers.
static class	Format.Field Defines constants that are used as attribute keys in the AttributedCharacterIterator returned from Format.formatToCharacterIterator and as field identifiers in FieldPosition.
class	MessageFormat MessageFormat provides a means to produce concatenated messages in a language-neutral way.
static class	MessageFormat.Field Defines constants that are used as attribute keys in the AttributedCharacterIterator returned from MessageFormat.formatToCharacterIterator.
class	NumberFormat NumberFormat is the abstract base class for all number formats.
static class	NumberFormat.Field Defines constants that are used as attribute keys in the AttributedCharacterIterator returned from NumberFormat.formatToCharacterIterator and as field identifiers in FieldPosition.
class	ParseException Signals that an error has been reached unexpectedly while parsing.
class	ParsePosition ParsePosition is a simple class used by Format and its subclasses to keep track of the current position during parsing.
class	SimpleDateFormat SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner.

Methods in java.text that return Object

Modifier and Type	Method and Description
Object	SimpleDateFormat.clone() Creates a copy of this SimpleDateFormat.
Object	NumberFormat.clone() Overrides Cloneable
Object	MessageFormat.clone() Creates and returns a copy of this object.
Object	Format.clone() Creates and returns a copy of this object.
Object	DecimalFormatSymbols.clone() Standard override.
Object	DecimalFormat.clone() Standard override; no change in semantics.
Object	DateFormatSymbols.clone() Overrides Cloneable
Object	DateFormat.clone() Overrides Cloneable
Object	ChoiceFormat.clone() Overrides Cloneable
Object	CharacterIterator.clone() Create a copy of this iterator
Object	AttributedCharacterIterator.getAttribute(AttributedCharacterIterator.Attribute attribute) Returns the value of the named attribute for the current character.
Object[]	ChoiceFormat.getFormats() Get the formats passed in the constructor.
Object	Annotation.getValue() Returns the value of the attribute, which may be null.
Object[]	MessageFormat.parse(String source) Parses text from the beginning of the given string to produce an object array.
Object[]	MessageFormat.parse(String source, ParsePosition pos) Parses the string.
Object	Format.parseObject(String source) Parses text from the beginning of the given string to produce an object.
Object	NumberFormat.parseObject(String source, ParsePosition pos) Parses text from a string to produce a Number.
Object	MessageFormat.parseObject(String source, ParsePosition pos) Parses text from a string to produce an object array.
abstract Object	Format.parseObject(String source, ParsePosition pos) Parses text from a string to produce an object.
Object	DateFormat.parseObject(String source, ParsePosition pos) Parses text from a string to produce a Date.
protected Object	NumberFormat.Field.readResolve() Resolves instances being deserialized to the predefined constants.
protected Object	MessageFormat.Field.readResolve() Resolves instances being deserialized to the predefined constants.
protected Object	DateFormat.Field.readResolve() Resolves instances being deserialized to the predefined constants.
protected Object	AttributedCharacterIterator.Attribute.readResolve() Resolves instances being deserialized to the predefined constants.

Methods in java.text that return types with arguments of type Object

Modifier and Type	Method and Description
Map<AttributedCharacterIterator.Attribute,Object>	AttributedCharacterIterator.getAttributes() Returns a map with the attributes defined on the current character.

Methods in java.text with parameters of type Object

Modifier and Type	Method and Description
void	AttributedString.addAttribute(AttributedCharacterIterator.Attribute attribute, Object value) Adds an attribute to the entire string.
void	AttributedString.addAttribute(AttributedCharacterIterator.Attribute attribute, Object value, int beginIndex, int endIndex) Adds an attribute to a subrange of the string.
boolean	SimpleDateFormat.equals(Object obj) Compares the given object with this SimpleDateFormat for equality.
boolean	ParsePosition.equals(Object obj) Overrides equals
boolean	NumberFormat.equals(Object obj) Overrides equals
boolean	MessageFormat.equals(Object obj) Equality comparison between two message format objects
boolean	FieldPosition.equals(Object obj) Overrides equals
boolean	DecimalFormatSymbols.equals(Object obj) Override equals.
boolean	DecimalFormat.equals(Object obj) Overrides equals
boolean	DateFormatSymbols.equals(Object obj) Override equals
boolean	DateFormat.equals(Object obj) Overrides equals
boolean	ChoiceFormat.equals(Object obj) Equality comparision between two
boolean	AttributedCharacterIterator.Attribute.equals(Object obj) Compares two objects for equality.
String	Format.format(Object obj) Formats an object to produce a string.
StringBuffer	MessageFormat.format(Object[] arguments, StringBuffer result, FieldPosition pos) Formats an array of objects and appends the MessageFormat's pattern, with format elements replaced by the formatted objects, to the provided StringBuffer.
StringBuffer	NumberFormat.format(Object number, StringBuffer toAppendTo, FieldPosition pos) Formats a number and appends the resulting text to the given string buffer.
StringBuffer	MessageFormat.format(Object arguments, StringBuffer result, FieldPosition pos) Formats an array of objects and appends the MessageFormat's pattern, with format elements replaced by the formatted objects, to the provided StringBuffer.
abstract StringBuffer	Format.format(Object obj, StringBuffer toAppendTo, FieldPosition pos) Formats an object and appends the resulting text to a given string buffer.
StringBuffer	DecimalFormat.format(Object number, StringBuffer toAppendTo, FieldPosition pos) Formats a number and appends the resulting text to the given string buffer.
StringBuffer	DateFormat.format(Object obj, StringBuffer toAppendTo, FieldPosition fieldPosition) Overrides Format.
static String	MessageFormat.format(String pattern, Object... arguments) Creates a MessageFormat with the given pattern and uses it to format the given arguments.
AttributedCharacterIterator	SimpleDateFormat.formatToCharacterIterator(Object obj) Formats an Object producing an AttributedCharacterIterator.
AttributedCharacterIterator	MessageFormat.formatToCharacterIterator(Object arguments) Formats an array of objects and inserts them into the MessageFormat's pattern, producing an AttributedCharacterIterator.
AttributedCharacterIterator	Format.formatToCharacterIterator(Object obj) Formats an Object producing an AttributedCharacterIterator.
AttributedCharacterIterator	DecimalFormat.formatToCharacterIterator(Object obj) Formats an Object producing an AttributedCharacterIterator.

Constructors in java.text with parameters of type Object

Constructor and Description
Annotation(Object value) Constructs an annotation record with the given value, which may be null.

Uses of Object in java.util

Subclasses of Object in java.util

Modifier and Type	Class and Description
class	AbstractCollection<E> This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
class	AbstractList<E> This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
class	AbstractMap<K,V> This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
static class	AbstractMap.SimpleEntry<K,V> An Entry maintaining a key and a value.
static class	AbstractMap.SimpleImmutableEntry<K,V> An Entry maintaining an immutable key and value.
class	AbstractQueue<E> This class provides skeletal implementations of some Queue operations.
class	AbstractSequentialList<E> This class provides a skeletal implementation of the List interface to minimize the effort required to implement this interface backed by a "sequential access" data store (such as a linked list).
class	AbstractSet<E> This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
class	ArrayDeque<E> Resizable-array implementation of the Deque interface.
class	ArrayList<E> Resizable-array implementation of the List interface.
class	Arrays This class contains various methods for manipulating arrays (such as sorting and searching).
class	BitSet This class implements a vector of bits that grows as needed.
class	Calendar The Calendar class is an abstract class that provides methods for converting between a specific instant in time and a set of calendar fields such as YEAR, MONTH, DAY_OF_MONTH, HOUR, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
class	Collections This class consists exclusively of static methods that operate on or return collections.
class	ConcurrentModificationException This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
class	Currency Represents a currency.
class	Date The class Date represents a specific instant in time, with millisecond precision.
class	Dictionary<K,V> The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
class	DoubleSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
class	EmptyStackException Thrown by methods in the Stack class to indicate that the stack is empty.
class	EnumMap<K extends Enum<K>,V> A specialized Map implementation for use with enum type keys.
class	EnumSet<E extends Enum<E>> A specialized Set implementation for use with enum types.
class	EventListenerProxy<T extends EventListener> An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.
class	EventObject The root class from which all event state objects shall be derived.
class	HashMap<K,V> Hash table based implementation of the Map interface.
class	HashSet<E> This class implements the Set interface, backed by a hash table (actually a HashMap instance).
class	Hashtable<K,V> This class implements a hash table, which maps keys to values.
class	IdentityHashMap<K,V> This class implements the Map interface with a hash table, using reference-equality in place of object-equality when comparing keys (and values).
class	IntSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
class	LinkedHashMap<K,V> Hash table and linked list implementation of the Map interface, with predictable iteration order.
class	LinkedHashSet<E> Hash table and linked list implementation of the Set interface, with predictable iteration order.
class	LinkedList<E> Doubly-linked list implementation of the List and Deque interfaces.
class	Locale A Locale object represents a specific geographical, political, or cultural region.
class	LongSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
class	MissingResourceException Signals that a resource is missing.
class	NoSuchElementException Thrown by the nextElement method of an Enumeration to indicate that there are no more elements in the enumeration.
class	Objects This class consists of static utility methods for operating on objects.
class	Optional<T>
class	OptionalDouble A container object which may or may not contain a double value.
class	OptionalInt A container object which may or may not contain a int value.
class	OptionalLong A container object which may or may not contain a long value.
class	PriorityQueue<E> An unbounded priority queue based on a priority heap.
class	Properties The Properties class represents a persistent set of properties.
class	PropertyResourceBundle PropertyResourceBundle is a concrete subclass of ResourceBundle that manages resources for a locale using a set of static strings from a property file.
class	Random An instance of this class is used to generate a stream of pseudorandom numbers.
class	ResourceBundle Resource bundles contain locale-specific objects.
static class	ResourceBundle.Control ResourceBundle.Control defines a set of callback methods that are invoked by the ResourceBundle.getBundle factory methods during the bundle loading process.
class	ServiceConfigurationError Error thrown when something goes wrong while loading a service provider.
class	ServiceLoader<S> A simple service-provider loading facility.
class	SimpleTimeZone SimpleTimeZone is a concrete subclass of TimeZone that represents a time zone for use with a Gregorian calendar.
class	Spliterators Static classes and methods for operating on or creating instances of Spliterator and its primitive specializations Spliterator.OfInt, Spliterator.OfLong, and Spliterator.OfDouble.
static class	Spliterators.AbstractDoubleSpliterator An abstract Spliterator.OfDouble that implements trySplit to permit limited parallelism.
static class	Spliterators.AbstractIntSpliterator An abstract Spliterator.OfInt that implements trySplit to permit limited parallelism.
static class	Spliterators.AbstractLongSpliterator An abstract Spliterator.OfLong that implements trySplit to permit limited parallelism.
static class	Spliterators.AbstractSpliterator<T> An abstract Spliterator that implements trySplit to permit limited parallelism.
class	Stack<E> The Stack class represents a last-in-first-out (LIFO) stack of objects.
class	StringJoiner StringJoiner is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix.
class	StringTokenizer The string tokenizer class allows an application to break a string into tokens.
class	Timer A facility for threads to schedule tasks for future execution in a background thread.
class	TimerTask A task that can be scheduled for one-time or repeated execution by a Timer.
class	TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
class	TreeMap<K,V> A Red-Black tree based NavigableMap implementation.
class	TreeSet<E> A NavigableSet implementation based on a TreeMap.
class	Vector<E> The Vector class implements a growable array of objects.
class	WeakHashMap<K,V> Hash table based implementation of the Map interface, with weak keys.

Fields in java.util declared as Object

Modifier and Type	Field and Description
protected Object[]	Vector.elementData The array buffer into which the components of the vector are stored.
protected Object	EventObject.source The object on which the Event initially occurred.

Methods in java.util with type parameters of type Object

Modifier and Type	Method and Description
static <T extends Object & Comparable<? super T>> T	Collections.max(Collection<? extends T> coll) Returns the maximum element of the given collection, according to the natural ordering of its elements.
static <T extends Object & Comparable<? super T>> T	Collections.min(Collection<? extends T> coll) Returns the minimum element of the given collection, according to the natural ordering of its elements.

Methods in java.util that return Object

Modifier and Type	Method and Description
Object	Vector.clone() Returns a clone of this vector.
Object	TreeSet.clone() Returns a shallow copy of this TreeSet instance.
Object	TreeMap.clone() Returns a shallow copy of this TreeMap instance.
Object	TimeZone.clone() Creates a copy of this TimeZone.
Object	SimpleTimeZone.clone() Returns a clone of this SimpleTimeZone instance.
Object	Locale.clone() Overrides Cloneable.
Object	LinkedList.clone() Returns a shallow copy of this LinkedList.
Object	IdentityHashMap.clone() Returns a shallow copy of this identity hash map: the keys and values themselves are not cloned.
Object	Hashtable.clone() Creates a shallow copy of this hashtable.
Object	HashSet.clone() Returns a shallow copy of this HashSet instance: the elements themselves are not cloned.
Object	HashMap.clone() Returns a shallow copy of this HashMap instance: the keys and values themselves are not cloned.
Object	Date.clone() Return a copy of this object.
Object	Calendar.clone() Creates and returns a copy of this object.
Object	BitSet.clone() Cloning this BitSet produces a new BitSet that is equal to it.
Object	ArrayList.clone() Returns a shallow copy of this ArrayList instance.
protected Object	AbstractMap.clone() Returns a shallow copy of this AbstractMap instance: the keys and values themselves are not cloned.
static <T> T[]	Arrays.copyOf(T[] original, int newLength) Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
static <T,U> T[]	Arrays.copyOf(U[] original, int newLength, Class<? extends T[]> newType) Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
static <T> T[]	Arrays.copyOfRange(T[] original, int from, int to) Copies the specified range of the specified array into a new array.
static <T,U> T[]	Arrays.copyOfRange(U[] original, int from, int to, Class<? extends T[]> newType) Copies the specified range of the specified array into a new array.
Object	ResourceBundle.getObject(String key) Gets an object for the given key from this resource bundle or one of its parents.
Object	EventObject.getSource() The object on which the Event initially occurred.
protected abstract Object	ResourceBundle.handleGetObject(String key) Gets an object for the given key from this resource bundle.
Object	PropertyResourceBundle.handleGetObject(String key)
Object	StringTokenizer.nextElement() Returns the same value as the nextToken method, except that its declared return value is Object rather than String.
Object	Properties.setProperty(String key, String value) Calls the Hashtable method put.
Object[]	Vector.toArray() Returns an array containing all of the elements in this Vector in the correct order.
Object[]	Set.toArray() Returns an array containing all of the elements in this set.
Object[]	PriorityQueue.toArray() Returns an array containing all of the elements in this queue.
Object[]	List.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	LinkedList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	Collection.toArray() Returns an array containing all of the elements in this collection.
Object[]	ArrayList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	ArrayDeque.toArray() Returns an array containing all of the elements in this deque in proper sequence (from first to last element).
Object[]	AbstractCollection.toArray() Returns an array containing all of the elements in this collection.
<T> T[]	Vector.toArray(T[] a) Returns an array containing all of the elements in this Vector in the correct order; the runtime type of the returned array is that of the specified array.
<T> T[]	Set.toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
<T> T[]	PriorityQueue.toArray(T[] a) Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array.
<T> T[]	List.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	LinkedList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	Collection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayDeque.toArray(T[] a) Returns an array containing all of the elements in this deque in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	AbstractCollection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.

Methods in java.util with parameters of type Object

Modifier and Type	Method and Description
static <T> boolean	Collections.addAll(Collection<? super T> c, T... elements) Adds all of the specified elements to the specified collection.
boolean	Calendar.after(Object when) Returns whether this Calendar represents a time after the time represented by the specified Object.
static <T> List<T>	Arrays.asList(T... a) Returns a fixed-size list backed by the specified array.
boolean	Calendar.before(Object when) Returns whether this Calendar represents a time before the time represented by the specified Object.
static int	Arrays.binarySearch(Object[] a, int fromIndex, int toIndex, Object key) Searches a range of the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, int fromIndex, int toIndex, Object key) Searches a range of the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, Object key) Searches the specified array for the specified object using the binary search algorithm.
static int	Arrays.binarySearch(Object[] a, Object key) Searches the specified array for the specified object using the binary search algorithm.
static <T> int	Arrays.binarySearch(T[] a, int fromIndex, int toIndex, T key, Comparator<? super T> c) Searches a range of the specified array for the specified object using the binary search algorithm.
static <T> int	Arrays.binarySearch(T[] a, T key, Comparator<? super T> c) Searches the specified array for the specified object using the binary search algorithm.
boolean	Vector.contains(Object o) Returns true if this vector contains the specified element.
boolean	TreeSet.contains(Object o) Returns true if this set contains the specified element.
boolean	Set.contains(Object o) Returns true if this set contains the specified element.
boolean	PriorityQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	List.contains(Object o) Returns true if this list contains the specified element.
boolean	LinkedList.contains(Object o) Returns true if this list contains the specified element.
boolean	Hashtable.contains(Object value) Tests if some key maps into the specified value in this hashtable.
boolean	HashSet.contains(Object o) Returns true if this set contains the specified element.
boolean	Deque.contains(Object o) Returns true if this deque contains the specified element.
boolean	Collection.contains(Object o) Returns true if this collection contains the specified element.
boolean	ArrayList.contains(Object o) Returns true if this list contains the specified element.
boolean	ArrayDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	AbstractCollection.contains(Object o) Returns true if this collection contains the specified element.
boolean	WeakHashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	TreeMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	Map.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	IdentityHashMap.containsKey(Object key) Tests whether the specified object reference is a key in this identity hash map.
boolean	Hashtable.containsKey(Object key) Tests if the specified object is a key in this hashtable.
boolean	HashMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	EnumMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	AbstractMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	WeakHashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	TreeMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	Map.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	LinkedHashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	IdentityHashMap.containsValue(Object value) Tests whether the specified object reference is a value in this identity hash map.
boolean	Hashtable.containsValue(Object value) Returns true if this hashtable maps one or more keys to this value.
boolean	HashMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	EnumMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	AbstractMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
void	Vector.copyInto(Object[] anArray) Copies the components of this vector into the specified array.
static <T> T[]	Arrays.copyOf(T[] original, int newLength) Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
static <T,U> T[]	Arrays.copyOf(U[] original, int newLength, Class<? extends T[]> newType) Copies the specified array, truncating or padding with nulls (if necessary) so the copy has the specified length.
static <T> T[]	Arrays.copyOfRange(T[] original, int from, int to) Copies the specified range of the specified array into a new array.
static <T,U> T[]	Arrays.copyOfRange(U[] original, int from, int to, Class<? extends T[]> newType) Copies the specified range of the specified array into a new array.
static boolean	Arrays.deepEquals(Object[] a1, Object[] a2) Returns true if the two specified arrays are deeply equal to one another.
static boolean	Arrays.deepEquals(Object[] a1, Object[] a2) Returns true if the two specified arrays are deeply equal to one another.
static boolean	Objects.deepEquals(Object a, Object b) Returns true if the arguments are deeply equal to each other and false otherwise.
static int	Arrays.deepHashCode(Object[] a) Returns a hash code based on the "deep contents" of the specified array.
static String	Arrays.deepToString(Object[] a) Returns a string representation of the "deep contents" of the specified array.
boolean	Vector.equals(Object o) Compares the specified Object with this Vector for equality.
boolean	SimpleTimeZone.equals(Object obj) Compares the equality of two SimpleTimeZone objects.
boolean	Set.equals(Object o) Compares the specified object with this set for equality.
boolean	OptionalLong.equals(Object obj) Indicates whether some other object is "equal to" this OptionalLong.
boolean	OptionalInt.equals(Object obj) Indicates whether some other object is "equal to" this OptionalInt.
boolean	OptionalDouble.equals(Object obj) Indicates whether some other object is "equal to" this OptionalDouble.
boolean	Optional.equals(Object obj) Indicates whether some other object is "equal to" this Optional.
boolean	Map.equals(Object o) Compares the specified object with this map for equality.
boolean	Map.Entry.equals(Object o) Compares the specified object with this entry for equality.
boolean	Locale.equals(Object obj)
boolean	List.equals(Object o) Compares the specified object with this list for equality.
boolean	IdentityHashMap.equals(Object o) Compares the specified object with this map for equality.
boolean	Hashtable.equals(Object o) Compares the specified Object with this Map for equality, as per the definition in the Map interface.
boolean	EnumMap.equals(Object o) Compares the specified object with this map for equality.
boolean	Date.equals(Object obj) Compares two dates for equality.
boolean	Comparator.equals(Object obj) Indicates whether some other object is "equal to" this comparator.
boolean	Collection.equals(Object o) Compares the specified object with this collection for equality.
boolean	Calendar.equals(Object obj) Compares this Calendar to the specified Object.
boolean	BitSet.equals(Object obj) Compares this object against the specified object.
boolean	AbstractSet.equals(Object o) Compares the specified object with this set for equality.
boolean	AbstractMap.equals(Object o) Compares the specified object with this map for equality.
boolean	AbstractMap.SimpleEntry.equals(Object o) Compares the specified object with this entry for equality.
boolean	AbstractMap.SimpleImmutableEntry.equals(Object o) Compares the specified object with this entry for equality.
boolean	AbstractList.equals(Object o) Compares the specified object with this list for equality.
static boolean	Arrays.equals(Object[] a, Object[] a2) Returns true if the two specified arrays of Objects are equal to one another.
static boolean	Arrays.equals(Object[] a, Object[] a2) Returns true if the two specified arrays of Objects are equal to one another.
static boolean	Objects.equals(Object a, Object b) Returns true if the arguments are equal to each other and false otherwise.
static void	Arrays.fill(Object[] a, int fromIndex, int toIndex, Object val) Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
static void	Arrays.fill(Object[] a, int fromIndex, int toIndex, Object val) Assigns the specified Object reference to each element of the specified range of the specified array of Objects.
static void	Arrays.fill(Object[] a, Object val) Assigns the specified Object reference to each element of the specified array of Objects.
static void	Arrays.fill(Object[] a, Object val) Assigns the specified Object reference to each element of the specified array of Objects.
static int	Collections.frequency(Collection<?> c, Object o) Returns the number of elements in the specified collection equal to the specified object.
V	WeakHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	TreeMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	Map.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	LinkedHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	IdentityHashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	Hashtable.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	HashMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	EnumMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
abstract V	Dictionary.get(Object key) Returns the value to which the key is mapped in this dictionary.
V	AbstractMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
default V	Map.getOrDefault(Object key, V defaultValue) Returns the value to which the specified key is mapped, or defaultValue if this map contains no mapping for the key.
static int	Objects.hash(Object... values) Generates a hash code for a sequence of input values.
static int	Objects.hashCode(Object o) Returns the hash code of a non-null argument and 0 for a null argument.
static int	Arrays.hashCode(Object[] a) Returns a hash code based on the contents of the specified array.
int	Vector.indexOf(Object o) Returns the index of the first occurrence of the specified element in this vector, or -1 if this vector does not contain the element.
int	List.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	LinkedList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	ArrayList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	AbstractList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	Vector.indexOf(Object o, int index) Returns the index of the first occurrence of the specified element in this vector, searching forwards from index, or returns -1 if the element is not found.
static boolean	Objects.isNull(Object obj) Returns true if the provided reference is null otherwise returns false.
int	Vector.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this vector, or -1 if this vector does not contain the element.
int	List.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	LinkedList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	ArrayList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	AbstractList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	Vector.lastIndexOf(Object o, int index) Returns the index of the last occurrence of the specified element in this vector, searching backwards from index, or returns -1 if the element is not found.
static boolean	Objects.nonNull(Object obj) Returns true if the provided reference is non-null otherwise returns false.
static <T> void	Arrays.parallelPrefix(T[] array, BinaryOperator<T> op) Cumulates, in parallel, each element of the given array in place, using the supplied function.
static <T> void	Arrays.parallelPrefix(T[] array, int fromIndex, int toIndex, BinaryOperator<T> op) Performs Arrays.parallelPrefix(Object[], BinaryOperator) for the given subrange of the array.
static <T> void	Arrays.parallelSetAll(T[] array, IntFunction<? extends T> generator) Set all elements of the specified array, in parallel, using the provided generator function to compute each element.
static <T> void	Arrays.parallelSort(T[] a, Comparator<? super T> cmp) Sorts the specified array of objects according to the order induced by the specified comparator.
static <T> void	Arrays.parallelSort(T[] a, int fromIndex, int toIndex, Comparator<? super T> cmp) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
V	WeakHashMap.remove(Object key) Removes the mapping for a key from this weak hash map if it is present.
boolean	Vector.remove(Object o) Removes the first occurrence of the specified element in this Vector If the Vector does not contain the element, it is unchanged.
boolean	TreeSet.remove(Object o) Removes the specified element from this set if it is present.
V	TreeMap.remove(Object key) Removes the mapping for this key from this TreeMap if present.
boolean	Set.remove(Object o) Removes the specified element from this set if it is present (optional operation).
boolean	PriorityQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
V	Map.remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
boolean	List.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present (optional operation).
boolean	LinkedList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
V	IdentityHashMap.remove(Object key) Removes the mapping for this key from this map if present.
V	Hashtable.remove(Object key) Removes the key (and its corresponding value) from this hashtable.
boolean	HashSet.remove(Object o) Removes the specified element from this set if it is present.
V	HashMap.remove(Object key) Removes the mapping for the specified key from this map if present.
V	EnumMap.remove(Object key) Removes the mapping for this key from this map if present.
abstract V	Dictionary.remove(Object key) Removes the key (and its corresponding value) from this dictionary.
boolean	Deque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	Collection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
boolean	ArrayList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
boolean	ArrayDeque.remove(Object o) Removes a single instance of the specified element from this deque.
V	AbstractMap.remove(Object key) Removes the mapping for a key from this map if it is present (optional operation).
boolean	AbstractCollection.remove(Object o) Removes a single instance of the specified element from this collection, if it is present (optional operation).
default boolean	Map.remove(Object key, Object value) Removes the entry for the specified key only if it is currently mapped to the specified value.
boolean	Vector.removeElement(Object obj) Removes the first (lowest-indexed) occurrence of the argument from this vector.
boolean	LinkedList.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element in this list (when traversing the list from head to tail).
boolean	Deque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element from this deque.
boolean	ArrayDeque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element in this deque (when traversing the deque from head to tail).
boolean	LinkedList.removeLastOccurrence(Object o) Removes the last occurrence of the specified element in this list (when traversing the list from head to tail).
boolean	Deque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element from this deque.
boolean	ArrayDeque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element in this deque (when traversing the deque from head to tail).
int	Stack.search(Object o) Returns the 1-based position where an object is on this stack.
static <T> void	Arrays.setAll(T[] array, IntFunction<? extends T> generator) Set all elements of the specified array, using the provided generator function to compute each element.
static void	Arrays.sort(Object[] a) Sorts the specified array of objects into ascending order, according to the natural ordering of its elements.
static void	Arrays.sort(Object[] a, int fromIndex, int toIndex) Sorts the specified range of the specified array of objects into ascending order, according to the natural ordering of its elements.
static <T> void	Arrays.sort(T[] a, Comparator<? super T> c) Sorts the specified array of objects according to the order induced by the specified comparator.
static <T> void	Arrays.sort(T[] a, int fromIndex, int toIndex, Comparator<? super T> c) Sorts the specified range of the specified array of objects according to the order induced by the specified comparator.
static <T> Spliterator<T>	Spliterators.spliterator(Object[] array, int additionalCharacteristics) Creates a Spliterator covering the elements of a given array, using a customized set of spliterator characteristics.
static <T> Spliterator<T>	Spliterators.spliterator(Object[] array, int fromIndex, int toIndex, int additionalCharacteristics) Creates a Spliterator covering a range of elements of a given array, using a customized set of spliterator characteristics.
static <T> Spliterator<T>	Arrays.spliterator(T[] array) Returns a Spliterator covering all of the specified array.
static <T> Spliterator<T>	Arrays.spliterator(T[] array, int startInclusive, int endExclusive) Returns a Spliterator covering the specified range of the specified array.
static <T> Stream<T>	Arrays.stream(T[] array) Returns a sequential Stream with the specified array as its source.
static <T> Stream<T>	Arrays.stream(T[] array, int startInclusive, int endExclusive) Returns a sequential Stream with the specified range of the specified array as its source.
<T> T[]	Vector.toArray(T[] a) Returns an array containing all of the elements in this Vector in the correct order; the runtime type of the returned array is that of the specified array.
<T> T[]	Set.toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
<T> T[]	PriorityQueue.toArray(T[] a) Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array.
<T> T[]	List.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	LinkedList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	Collection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayDeque.toArray(T[] a) Returns an array containing all of the elements in this deque in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	AbstractCollection.toArray(T[] a) Returns an array containing all of the elements in this collection; the runtime type of the returned array is that of the specified array.
static String	Objects.toString(Object o) Returns the result of calling toString for a non-null argument and "null" for a null argument.
static String	Arrays.toString(Object[] a) Returns a string representation of the contents of the specified array.
static String	Objects.toString(Object o, String nullDefault) Returns the result of calling toString on the first argument if the first argument is not null and returns the second argument otherwise.

Constructors in java.util with parameters of type Object

Constructor and Description
EventObject(Object source) Constructs a prototypical Event.

Uses of Object in java.util.concurrent

Subclasses of Object in java.util.concurrent

Modifier and Type	Class and Description
class	AbstractExecutorService Provides default implementations of ExecutorService execution methods.
class	ArrayBlockingQueue<E> A bounded blocking queue backed by an array.
class	BrokenBarrierException Exception thrown when a thread tries to wait upon a barrier that is in a broken state, or which enters the broken state while the thread is waiting.
class	CancellationException Exception indicating that the result of a value-producing task, such as a FutureTask, cannot be retrieved because the task was cancelled.
class	ConcurrentHashMap<K,V> A hash table supporting full concurrency of retrievals and adjustable expected concurrency for updates.
class	ConcurrentLinkedDeque<E> An unbounded concurrent deque based on linked nodes.
class	ConcurrentLinkedQueue<E> An unbounded thread-safe queue based on linked nodes.
class	ConcurrentSkipListMap<K,V> A scalable concurrent ConcurrentNavigableMap implementation.
class	ConcurrentSkipListSet<E> A scalable concurrent NavigableSet implementation based on a ConcurrentSkipListMap.
class	CopyOnWriteArrayList<E> A thread-safe variant of ArrayList in which all mutative operations (add, set, and so on) are implemented by making a fresh copy of the underlying array.
class	CopyOnWriteArraySet<E> A Set that uses an internal CopyOnWriteArrayList for all of its operations.
class	CountDownLatch A synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.
class	CountedCompleter<T> A ForkJoinTask with a completion action performed when triggered and there are no remaining pending actions.
class	CyclicBarrier A synchronization aid that allows a set of threads to all wait for each other to reach a common barrier point.
class	DelayQueue<E extends Delayed> An unbounded blocking queue of Delayed elements, in which an element can only be taken when its delay has expired.
class	Exchanger<V> A synchronization point at which threads can pair and swap elements within pairs.
class	ExecutionException Exception thrown when attempting to retrieve the result of a task that aborted by throwing an exception.
class	ExecutorCompletionService<V> A CompletionService that uses a supplied Executor to execute tasks.
class	Executors Factory and utility methods for Executor, ExecutorService, ScheduledExecutorService, ThreadFactory, and Callable classes defined in this package.
class	ForkJoinPool An ExecutorService for running ForkJoinTasks.
class	ForkJoinTask<V> Abstract base class for tasks that run within a ForkJoinPool.
class	ForkJoinWorkerThread A thread managed by a ForkJoinPool, which executes ForkJoinTasks.
class	FutureTask<V> A cancellable asynchronous computation.
class	LinkedBlockingDeque<E> An optionally-bounded blocking deque based on linked nodes.
class	LinkedBlockingQueue<E> An optionally-bounded blocking queue based on linked nodes.
class	LinkedTransferQueue<E> An unbounded TransferQueue based on linked nodes.
class	Phaser A reusable synchronization barrier, similar in functionality to CyclicBarrier and CountDownLatch but supporting more flexible usage.
class	PriorityBlockingQueue<E> An unbounded blocking queue that uses the same ordering rules as class PriorityQueue and supplies blocking retrieval operations.
class	RecursiveAction A recursive resultless ForkJoinTask.
class	RecursiveTask<V> A recursive result-bearing ForkJoinTask.
class	RejectedExecutionException Exception thrown by an Executor when a task cannot be accepted for execution.
class	ScheduledThreadPoolExecutor A ThreadPoolExecutor that can additionally schedule commands to run after a given delay, or to execute periodically.
class	Semaphore A counting semaphore.
class	SynchronousQueue<E> A blocking queue in which each insert operation must wait for a corresponding remove operation by another thread, and vice versa.
class	ThreadLocalRandom A random number generator isolated to the current thread.
class	ThreadPoolExecutor An ExecutorService that executes each submitted task using one of possibly several pooled threads, normally configured using Executors factory methods.
static class	ThreadPoolExecutor.AbortPolicy A handler for rejected tasks that throws a RejectedExecutionException.
static class	ThreadPoolExecutor.CallerRunsPolicy A handler for rejected tasks that runs the rejected task directly in the calling thread of the execute method, unless the executor has been shut down, in which case the task is discarded.
static class	ThreadPoolExecutor.DiscardOldestPolicy A handler for rejected tasks that discards the oldest unhandled request and then retries execute, unless the executor is shut down, in which case the task is discarded.
static class	ThreadPoolExecutor.DiscardPolicy A handler for rejected tasks that silently discards the rejected task.
class	TimeoutException Exception thrown when a blocking operation times out.

Methods in java.util.concurrent that return Object

Modifier and Type	Method and Description
Object	CopyOnWriteArrayList.clone() Returns a shallow copy of this list.
Object[]	SynchronousQueue.toArray() Returns a zero-length array.
Object[]	PriorityBlockingQueue.toArray() Returns an array containing all of the elements in this queue.
Object[]	LinkedBlockingQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
Object[]	LinkedBlockingDeque.toArray() Returns an array containing all of the elements in this deque, in proper sequence (from first to last element).
Object[]	DelayQueue.toArray() Returns an array containing all of the elements in this queue.
Object[]	CopyOnWriteArraySet.toArray() Returns an array containing all of the elements in this set.
Object[]	CopyOnWriteArrayList.toArray() Returns an array containing all of the elements in this list in proper sequence (from first to last element).
Object[]	ConcurrentLinkedQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
Object[]	ConcurrentLinkedDeque.toArray() Returns an array containing all of the elements in this deque, in proper sequence (from first to last element).
Object[]	ArrayBlockingQueue.toArray() Returns an array containing all of the elements in this queue, in proper sequence.
<T> T[]	SynchronousQueue.toArray(T[] a) Sets the zeroeth element of the specified array to null (if the array has non-zero length) and returns it.
<T> T[]	PriorityBlockingQueue.toArray(T[] a) Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array.
<T> T[]	LinkedBlockingQueue.toArray(T[] a) Returns an array containing all of the elements in this queue, in proper sequence; the runtime type of the returned array is that of the specified array.
<T> T[]	LinkedBlockingDeque.toArray(T[] a) Returns an array containing all of the elements in this deque, in proper sequence; the runtime type of the returned array is that of the specified array.
<T> T[]	DelayQueue.toArray(T[] a) Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array.
<T> T[]	CopyOnWriteArraySet.toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
<T> T[]	CopyOnWriteArrayList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	ConcurrentLinkedQueue.toArray(T[] a) Returns an array containing all of the elements in this queue, in proper sequence; the runtime type of the returned array is that of the specified array.
<T> T[]	ConcurrentLinkedDeque.toArray(T[] a) Returns an array containing all of the elements in this deque, in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayBlockingQueue.toArray(T[] a) Returns an array containing all of the elements in this queue, in proper sequence; the runtime type of the returned array is that of the specified array.

Methods in java.util.concurrent that return types with arguments of type Object

Modifier and Type	Method and Description
static Callable<Object>	Executors.callable(PrivilegedAction<?> action) Returns a Callable object that, when called, runs the given privileged action and returns its result.
static Callable<Object>	Executors.callable(PrivilegedExceptionAction<?> action) Returns a Callable object that, when called, runs the given privileged exception action and returns its result.
static Callable<Object>	Executors.callable(Runnable task) Returns a Callable object that, when called, runs the given task and returns null.

Methods in java.util.concurrent with parameters of type Object

Modifier and Type	Method and Description
boolean	SynchronousQueue.contains(Object o) Always returns false.
boolean	PriorityBlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	LinkedTransferQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	LinkedBlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	LinkedBlockingDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	CopyOnWriteArraySet.contains(Object o) Returns true if this set contains the specified element.
boolean	CopyOnWriteArrayList.contains(Object o) Returns true if this list contains the specified element.
boolean	ConcurrentSkipListSet.contains(Object o) Returns true if this set contains the specified element.
boolean	ConcurrentLinkedQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	ConcurrentLinkedDeque.contains(Object o) Returns true if this deque contains at least one element e such that o.equals(e).
boolean	BlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	BlockingDeque.contains(Object o) Returns true if this deque contains the specified element.
boolean	ArrayBlockingQueue.contains(Object o) Returns true if this queue contains the specified element.
boolean	ConcurrentSkipListMap.containsKey(Object key) Returns true if this map contains a mapping for the specified key.
boolean	ConcurrentHashMap.containsKey(Object key)
boolean	ConcurrentSkipListMap.containsValue(Object value) Returns true if this map maps one or more keys to the specified value.
boolean	ConcurrentHashMap.containsValue(Object value)
boolean	CopyOnWriteArraySet.equals(Object o) Compares the specified object with this set for equality.
boolean	CopyOnWriteArrayList.equals(Object o) Compares the specified object with this list for equality.
boolean	ConcurrentSkipListSet.equals(Object o) Compares the specified object with this set for equality.
boolean	ConcurrentSkipListMap.equals(Object o) Compares the specified object with this map for equality.
boolean	ConcurrentHashMap.equals(Object o)
V	ConcurrentSkipListMap.get(Object key) Returns the value to which the specified key is mapped, or null if this map contains no mapping for the key.
V	ConcurrentHashMap.get(Object key)
int	CopyOnWriteArrayList.indexOf(Object o) Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
int	CopyOnWriteArrayList.lastIndexOf(Object o) Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.
boolean	SynchronousQueue.remove(Object o) Always returns false.
boolean	PriorityBlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	LinkedTransferQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	LinkedBlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	LinkedBlockingDeque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	DelayQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present, whether or not it has expired.
boolean	CopyOnWriteArraySet.remove(Object o) Removes the specified element from this set if it is present.
boolean	CopyOnWriteArrayList.remove(Object o) Removes the first occurrence of the specified element from this list, if it is present.
boolean	ConcurrentSkipListSet.remove(Object o) Removes the specified element from this set if it is present.
V	ConcurrentSkipListMap.remove(Object key) Removes the mapping for the specified key from this map if present.
boolean	ConcurrentLinkedQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	ConcurrentLinkedDeque.remove(Object o) Removes the first element e such that o.equals(e), if such an element exists in this deque.
V	ConcurrentHashMap.remove(Object key)
boolean	BlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	BlockingDeque.remove(Object o) Removes the first occurrence of the specified element from this deque.
boolean	ArrayBlockingQueue.remove(Object o) Removes a single instance of the specified element from this queue, if it is present.
boolean	ConcurrentSkipListMap.remove(Object key, Object value) Removes the entry for a key only if currently mapped to a given value.
boolean	ConcurrentMap.remove(Object key, Object value) Removes the entry for a key only if currently mapped to a given value.
boolean	ConcurrentHashMap.remove(Object key, Object value)
boolean	LinkedBlockingDeque.removeFirstOccurrence(Object o)
boolean	ConcurrentLinkedDeque.removeFirstOccurrence(Object o) Removes the first element e such that o.equals(e), if such an element exists in this deque.
boolean	BlockingDeque.removeFirstOccurrence(Object o) Removes the first occurrence of the specified element from this deque.
boolean	LinkedBlockingDeque.removeLastOccurrence(Object o)
boolean	ConcurrentLinkedDeque.removeLastOccurrence(Object o) Removes the last element e such that o.equals(e), if such an element exists in this deque.
boolean	BlockingDeque.removeLastOccurrence(Object o) Removes the last occurrence of the specified element from this deque.
void	TimeUnit.timedWait(Object obj, long timeout) Performs a timed Object.wait using this time unit.
<T> T[]	SynchronousQueue.toArray(T[] a) Sets the zeroeth element of the specified array to null (if the array has non-zero length) and returns it.
<T> T[]	PriorityBlockingQueue.toArray(T[] a) Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array.
<T> T[]	LinkedBlockingQueue.toArray(T[] a) Returns an array containing all of the elements in this queue, in proper sequence; the runtime type of the returned array is that of the specified array.
<T> T[]	LinkedBlockingDeque.toArray(T[] a) Returns an array containing all of the elements in this deque, in proper sequence; the runtime type of the returned array is that of the specified array.
<T> T[]	DelayQueue.toArray(T[] a) Returns an array containing all of the elements in this queue; the runtime type of the returned array is that of the specified array.
<T> T[]	CopyOnWriteArraySet.toArray(T[] a) Returns an array containing all of the elements in this set; the runtime type of the returned array is that of the specified array.
<T> T[]	CopyOnWriteArrayList.toArray(T[] a) Returns an array containing all of the elements in this list in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	ConcurrentLinkedQueue.toArray(T[] a) Returns an array containing all of the elements in this queue, in proper sequence; the runtime type of the returned array is that of the specified array.
<T> T[]	ConcurrentLinkedDeque.toArray(T[] a) Returns an array containing all of the elements in this deque, in proper sequence (from first to last element); the runtime type of the returned array is that of the specified array.
<T> T[]	ArrayBlockingQueue.toArray(T[] a) Returns an array containing all of the elements in this queue, in proper sequence; the runtime type of the returned array is that of the specified array.

Constructors in java.util.concurrent with parameters of type Object

Constructor and Description
CopyOnWriteArrayList(E[] toCopyIn) Creates a list holding a copy of the given array.

Uses of Object in java.util.concurrent.atomic

Subclasses of Object in java.util.concurrent.atomic

Modifier and Type	Class and Description
class	AtomicBoolean A boolean value that may be updated atomically.
class	AtomicInteger An int value that may be updated atomically.
class	AtomicIntegerArray An int array in which elements may be updated atomically.
class	AtomicIntegerFieldUpdater<T> A reflection-based utility that enables atomic updates to designated volatile int fields of designated classes.
class	AtomicLong A long value that may be updated atomically.
class	AtomicLongArray A long array in which elements may be updated atomically.
class	AtomicLongFieldUpdater<T> A reflection-based utility that enables atomic updates to designated volatile long fields of designated classes.
class	AtomicReference<V> An object reference that may be updated atomically.
class	AtomicReferenceArray<E> An array of object references in which elements may be updated atomically.
class	AtomicReferenceFieldUpdater<T,V> A reflection-based utility that enables atomic updates to designated volatile reference fields of designated classes.

Constructors in java.util.concurrent.atomic with parameters of type Object

Constructor and Description
AtomicReferenceArray(E[] array) Creates a new AtomicReferenceArray with the same length as, and all elements copied from, the given array.

Uses of Object in java.util.concurrent.locks

Subclasses of Object in java.util.concurrent.locks

Modifier and Type	Class and Description
class	AbstractOwnableSynchronizer A synchronizer that may be exclusively owned by a thread.
class	AbstractQueuedLongSynchronizer A version of AbstractQueuedSynchronizer in which synchronization state is maintained as a long.
class	AbstractQueuedLongSynchronizer.ConditionObject Condition implementation for a AbstractQueuedLongSynchronizer serving as the basis of a Lock implementation.
class	AbstractQueuedSynchronizer Provides a framework for implementing blocking locks and related synchronizers (semaphores, events, etc) that rely on first-in-first-out (FIFO) wait queues.
class	AbstractQueuedSynchronizer.ConditionObject Condition implementation for a AbstractQueuedSynchronizer serving as the basis of a Lock implementation.
class	LockSupport Basic thread blocking primitives for creating locks and other synchronization classes.
class	ReentrantLock A reentrant mutual exclusion Lock with the same basic behavior and semantics as the implicit monitor lock accessed using synchronized methods and statements, but with extended capabilities.
class	ReentrantReadWriteLock An implementation of ReadWriteLock supporting similar semantics to ReentrantLock.
static class	ReentrantReadWriteLock.ReadLock The lock returned by method ReentrantReadWriteLock.readLock().
static class	ReentrantReadWriteLock.WriteLock The lock returned by method ReentrantReadWriteLock.writeLock().

Methods in java.util.concurrent.locks that return Object

Modifier and Type	Method and Description
static Object	LockSupport.getBlocker(Thread t) Returns the blocker object supplied to the most recent invocation of a park method that has not yet unblocked, or null if not blocked.

Methods in java.util.concurrent.locks with parameters of type Object

Modifier and Type	Method and Description
static void	LockSupport.park(Object blocker) Disables the current thread for thread scheduling purposes unless the permit is available.
static void	LockSupport.parkNanos(Object blocker, long nanos) Disables the current thread for thread scheduling purposes, for up to the specified waiting time, unless the permit is available.
static void	LockSupport.parkUntil(Object blocker, long deadline) Disables the current thread for thread scheduling purposes, until the specified deadline, unless the permit is available.

Uses of Object in java.util.function

Methods in java.util.function with parameters of type Object

Modifier and Type	Method and Description
static <T> Predicate<T>	Predicate.isEqual(Object targetRef) Returns a predicate that tests if two arguments are equal according to Objects#equals(Object, Object).

Uses of Object in java.util.logging

Subclasses of Object in java.util.logging

Modifier and Type	Class and Description
class	Level The Level class defines a set of standard logging levels that can be used to control logging output.
class	Logger A Logger object is used to log messages for a specific system or application component.
class	LogRecord LogRecord objects are used to pass logging requests between the logging framework and individual log Handlers.

Methods in java.util.logging that return Object

Modifier and Type	Method and Description
Object[]	LogRecord.getParameters() Get the parameters to the log message.

Methods in java.util.logging with parameters of type Object

Modifier and Type	Method and Description
void	Logger.entering(String sourceClass, String sourceMethod, Object param1) Log a method entry, with one parameter.
void	Logger.entering(String sourceClass, String sourceMethod, Object[] params) Log a method entry, with an array of parameters.
boolean	Level.equals(Object ox) Compare two objects for value equality.
void	Logger.exiting(String sourceClass, String sourceMethod, Object result) Log a method return, with result object.
void	Logger.log(Level level, String msg, Object param1) Log a message, with one object parameter.
void	Logger.log(Level level, String msg, Object[] params) Log a message, with an array of object arguments.
void	Logger.logp(Level level, String sourceClass, String sourceMethod, String msg, Object param1) Log a message, specifying source class and method, with a single object parameter to the log message.
void	Logger.logp(Level level, String sourceClass, String sourceMethod, String msg, Object[] params) Log a message, specifying source class and method, with an array of object arguments.
void	Logger.logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String msg, Object param1) Log a message, specifying source class, method, and resource bundle name, with a single object parameter to the log message.
void	Logger.logrb(Level level, String sourceClass, String sourceMethod, String bundleName, String msg, Object[] params) Log a message, specifying source class, method, and resource bundle name, with an array of object arguments.
void	LogRecord.setParameters(Object[] parameters) Set the parameters to the log message.

Uses of Object in java.util.regex

Subclasses of Object in java.util.regex

Modifier and Type	Class and Description
class	Matcher An engine that performs match operations on a character sequence by interpreting a Pattern.
class	Pattern A compiled representation of a regular expression.
class	PatternSyntaxException Unchecked exception thrown to indicate a syntax error in a regular-expression pattern.

Uses of Object in java.util.stream

Subclasses of Object in java.util.stream

Modifier and Type	Class and Description
class	Collectors Implementations of Collector that implement various useful reduction operations, such as accumulating elements into collections, summarizing elements according to various criteria, etc.
class	StreamSupport Low-level utility methods for creating and manipulating streams.

Methods in java.util.stream that return Object

Modifier and Type	Method and Description
Object[]	Stream.toArray() Returns an array containing the elements of this stream.
<A> A[]	Stream.toArray(IntFunction<A[]> generator) Returns an array containing the elements of this stream, using the provided generator function to allocate the returned array, as well as any additional arrays that might be required for a partitioned execution or for resizing.

Methods in java.util.stream with parameters of type Object

Modifier and Type	Method and Description
static <T> Stream<T>	Stream.of(T... values) Returns a sequential ordered stream whose elements are the specified values.

Uses of Object in javax.annotation.processing

Subclasses of Object in javax.annotation.processing

Modifier and Type	Class and Description
class	AbstractProcessor

Uses of Object in org.apidesign.bck2brwsr.launcher.b2b

Subclasses of Object in org.apidesign.bck2brwsr.launcher.b2b

Modifier and Type	Class and Description
class	LauncherBck2Brwsr This is a launcher for the Bck2Brwsr project that is using Desktop (or Process) to display the external browser in separate process.

Uses of Object in org.apidesign.bck2brwsr.launcher.impl

Subclasses of Object in org.apidesign.bck2brwsr.launcher.impl

Modifier and Type	Class and Description
class	Console

Uses of Object in org.apidesign.vm4brwsr

Subclasses of Object in org.apidesign.vm4brwsr

Modifier and Type	Class and Description
class	Bck2Brwsr Build your own virtual machine! Use methods in this class to generate a skeleton JVM in JavaScript that contains pre-compiled classes of your choice:

Uses of Object in org.apidesign.vm4brwsr.api

Subclasses of Object in org.apidesign.vm4brwsr.api

Modifier and Type	Class and Description
class	VM Utility methods to talk to the Bck2Brwsr virtual machine.

Uses of Object in org.netbeans.modules.openide.util

Subclasses of Object in org.netbeans.modules.openide.util

Modifier and Type	Class and Description
class	GlobalLookup
class	NamedServiceProcessor
class	ServiceProviderProcessor

Uses of Object in org.openide.util

Subclasses of Object in org.openide.util

Modifier and Type	Class and Description
class	Lookup A general registry permitting clients to find instances of services (implementation of a given interface).
static class	Lookup.Item<T> A single item in a lookup result.
static class	Lookup.Result<T> Result of a lookup request.
static class	Lookup.Template<T> Template defining a pattern to filter instances by.
class	LookupEvent An event describing the change in the lookup's result.

Methods in org.openide.util with parameters of type Object

Modifier and Type	Method and Description
boolean	Lookup.Template.equals(Object obj)

Uses of Object in org.openide.util.lookup

Subclasses of Object in org.openide.util.lookup

Modifier and Type	Class and Description
class	AbstractLookup Implementation of the lookup from OpenAPIs that is based on the introduction of Item.
static class	AbstractLookup.Content A class that can be used by the creator of the AbstractLookup to control its content (a kind of Privileged API giving creator of the lookup more rights than subsequent users of the lookup).
static class	AbstractLookup.Pair<T> Extension to the default lookup item that offers additional information for the data structures use in AbstractLookup
class	InstanceContent A special content implementation that can be passed to AbstractLookup and provides methods for registration of instances and lazy instances.
class	Lookups Static factory methods for creating common lookup implementations.
class	ProxyLookup Implementation of lookup that can delegate to others.

Methods in org.openide.util.lookup with parameters of type Object

Modifier and Type	Method and Description
void	InstanceContent.add(Object inst) Adds an instance to the lookup.
protected abstract boolean	AbstractLookup.Pair.creatorOf(Object obj) Method that can test whether an instance of a class has been created by this item.
static Lookup	Lookups.fixed(Object... objectsToLookup) Creates a lookup that contains an array of objects specified via the parameter.
static <T,R> Lookup	Lookups.fixed(T[] keys, InstanceContent.Convertor<? super T,R> convertor) Creates a lookup that contains an array of objects specified via the parameter.
void	InstanceContent.remove(Object inst) Remove instance.
static Lookup	Lookups.singleton(Object objectToLookup) Creates a singleton lookup.

Uses of Object in org.openide.util.lookup.implspi

Subclasses of Object in org.openide.util.lookup.implspi

Modifier and Type	Class and Description
class	AbstractServiceProviderProcessor Infrastructure for generating META-INF/services/* and META-INF/namedservices/* registrations from annotations.
class	ActiveQueue Implementation of the active reference queue.
class	NamedServicesProvider Infrastructure provider interface for those who control the overall registration of services in the system.
class	SharedClassObjectBridge

Methods in org.openide.util.lookup.implspi that return types with arguments of type Object

Modifier and Type	Method and Description
static ReferenceQueue<Object>	ActiveQueue.queue() Gets the active reference queue.

Methods in org.openide.util.lookup.implspi with parameters of type Object

Modifier and Type	Method and Description
static Lookup	NamedServicesProvider.createLookupFor(Object obj) Allows the providers to donate a special lookup for a given object.
protected Lookup	NamedServicesProvider.lookupFor(Object obj) Method for providers to work in orchestration with NamedServicesProvider.createLookupFor(java.lang.Object).