Uses of Package
java.util

Packages that use java.util

Package	Description
java.beans
java.lang
java.lang.invoke
java.math	Provides classes for performing arbitrary-precision integer arithmetic (BigInteger) and arbitrary-precision decimal arithmetic (BigDecimal).
java.net
java.nio.charset
java.text
java.util
java.util.concurrent	Utility classes commonly useful in concurrent programming.
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.stream	Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
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.

Classes in java.util used by java.beans

Class and Description
EventListener A tagging interface that all event listener interfaces must extend.
EventListenerProxy An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener.
EventObject The root class from which all event state objects shall be derived.

Classes in java.util used by java.lang

Class and Description
Comparator A comparison function, which imposes a total ordering on some collection of objects.
Enumeration An object that implements the Enumeration interface generates a series of elements, one at a time.
Iterator An iterator over a collection.
Locale A Locale object represents a specific geographical, political, or cultural region.
Map An object that maps keys to values.
Properties The Properties class represents a persistent set of properties.
Spliterator An object for traversing and partitioning elements of a source.

Classes in java.util used by java.lang.invoke

Class and Description
List An ordered collection (also known as a sequence).

Classes in java.util used by java.math

Class and Description
Random An instance of this class is used to generate a stream of pseudorandom numbers.

Classes in java.util used by java.net

Class and Description
List An ordered collection (also known as a sequence).
Map An object that maps keys to values.

Classes in java.util used by java.nio.charset

Class and Description
Locale A Locale object represents a specific geographical, political, or cultural region.
Set A collection that contains no duplicate elements.
SortedMap A Map that further provides a total ordering on its keys.

Classes in java.util used by java.text

Class and Description
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.
Currency Represents a currency.
Date The class Date represents a specific instant in time, with millisecond precision.
Locale A Locale object represents a specific geographical, political, or cultural region.
Map An object that maps keys to values.
Set A collection that contains no duplicate elements.
TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.

Classes in java.util used by java.util

Class and Description
AbstractCollection This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
AbstractList 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).
AbstractMap This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
AbstractQueue This class provides skeletal implementations of some Queue operations.
AbstractSequentialList 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).
AbstractSet This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
ArrayDeque Resizable-array implementation of the Deque interface.
ArrayList Resizable-array implementation of the List interface.
BitSet This class implements a vector of bits that grows as needed.
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.
Collection The root interface in the collection hierarchy.
Comparator A comparison function, which imposes a total ordering on some collection of objects.
Currency Represents a currency.
Date The class Date represents a specific instant in time, with millisecond precision.
Deque A linear collection that supports element insertion and removal at both ends.
Dictionary The Dictionary class is the abstract parent of any class, such as Hashtable, which maps keys to values.
DoubleSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
Enumeration An object that implements the Enumeration interface generates a series of elements, one at a time.
EnumMap A specialized Map implementation for use with enum type keys.
EnumSet A specialized Set implementation for use with enum types.
EventListener A tagging interface that all event listener interfaces must extend.
HashMap Hash table based implementation of the Map interface.
HashSet This class implements the Set interface, backed by a hash table (actually a HashMap instance).
Hashtable This class implements a hash table, which maps keys to values.
IntSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
Iterator An iterator over a collection.
List An ordered collection (also known as a sequence).
ListIterator An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
Locale A Locale object represents a specific geographical, political, or cultural region.
Locale.Category Enum for locale categories.
LongSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
Map An object that maps keys to values.
Map.Entry A map entry (key-value pair).
NavigableMap A SortedMap extended with navigation methods returning the closest matches for given search targets.
NavigableSet A SortedSet extended with navigation methods reporting closest matches for given search targets.
Optional
OptionalDouble A container object which may or may not contain a double value.
OptionalInt A container object which may or may not contain a int value.
OptionalLong A container object which may or may not contain a long value.
PrimitiveIterator A base type for primitive specializations of Iterator.
PrimitiveIterator.OfDouble An Iterator specialized for double values.
PrimitiveIterator.OfInt An Iterator specialized for int values.
PrimitiveIterator.OfLong An Iterator specialized for long values.
PriorityQueue An unbounded priority queue based on a priority heap.
Properties The Properties class represents a persistent set of properties.
Queue A collection designed for holding elements prior to processing.
Random An instance of this class is used to generate a stream of pseudorandom numbers.
RandomAccess Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
ResourceBundle Resource bundles contain locale-specific objects.
ResourceBundle.Control ResourceBundle.Control defines a set of callback methods that are invoked by the ResourceBundle.getBundle factory methods during the bundle loading process.
ServiceLoader A simple service-provider loading facility.
Set A collection that contains no duplicate elements.
SortedMap A Map that further provides a total ordering on its keys.
SortedSet A Set that further provides a total ordering on its elements.
Spliterator An object for traversing and partitioning elements of a source.
Spliterator.OfDouble A Spliterator specialized for double values.
Spliterator.OfInt A Spliterator specialized for int values.
Spliterator.OfLong A Spliterator specialized for long values.
Spliterator.OfPrimitive A Spliterator specialized for primitive values.
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.
TimerTask A task that can be scheduled for one-time or repeated execution by a Timer.
TimeZone TimeZone represents a time zone offset, and also figures out daylight savings.
Vector The Vector class implements a growable array of objects.

Classes in java.util used by java.util.concurrent

Class and Description
AbstractCollection This class provides a skeletal implementation of the Collection interface, to minimize the effort required to implement this interface.
AbstractMap This class provides a skeletal implementation of the Map interface, to minimize the effort required to implement this interface.
AbstractQueue This class provides skeletal implementations of some Queue operations.
AbstractSet This class provides a skeletal implementation of the Set interface to minimize the effort required to implement this interface.
Collection The root interface in the collection hierarchy.
Comparator A comparison function, which imposes a total ordering on some collection of objects.
Deque A linear collection that supports element insertion and removal at both ends.
Iterator An iterator over a collection.
List An ordered collection (also known as a sequence).
ListIterator An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
Map An object that maps keys to values.
Map.Entry A map entry (key-value pair).
NavigableMap A SortedMap extended with navigation methods returning the closest matches for given search targets.
NavigableSet A SortedSet extended with navigation methods reporting closest matches for given search targets.
Queue A collection designed for holding elements prior to processing.
Random An instance of this class is used to generate a stream of pseudorandom numbers.
RandomAccess Marker interface used by List implementations to indicate that they support fast (generally constant time) random access.
Set A collection that contains no duplicate elements.
SortedMap A Map that further provides a total ordering on its keys.
SortedSet A Set that further provides a total ordering on its elements.

Classes in java.util used by java.util.concurrent.locks

Class and Description
Collection The root interface in the collection hierarchy.
Date The class Date represents a specific instant in time, with millisecond precision.

Classes in java.util used by java.util.function

Class and Description
Comparator A comparison function, which imposes a total ordering on some collection of objects.

Classes in java.util used by java.util.stream

Class and Description
Collection The root interface in the collection hierarchy.
Comparator A comparison function, which imposes a total ordering on some collection of objects.
DoubleSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
IntSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
Iterator An iterator over a collection.
List An ordered collection (also known as a sequence).
LongSummaryStatistics A state object for collecting statistics such as count, min, max, sum, and average.
Map An object that maps keys to values.
Optional
OptionalDouble A container object which may or may not contain a double value.
OptionalInt A container object which may or may not contain a int value.
OptionalLong A container object which may or may not contain a long value.
PrimitiveIterator.OfDouble An Iterator specialized for double values.
PrimitiveIterator.OfInt An Iterator specialized for int values.
PrimitiveIterator.OfLong An Iterator specialized for long values.
Set A collection that contains no duplicate elements.
Spliterator An object for traversing and partitioning elements of a source.
Spliterator.OfDouble A Spliterator specialized for double values.
Spliterator.OfInt A Spliterator specialized for int values.
Spliterator.OfLong A Spliterator specialized for long values.

Classes in java.util used by org.netbeans.modules.openide.util

Class and Description
Set A collection that contains no duplicate elements.

Classes in java.util used by org.openide.util

Class and Description
Collection The root interface in the collection hierarchy.
EventListener A tagging interface that all event listener interfaces must extend.
EventObject The root class from which all event state objects shall be derived.
Set A collection that contains no duplicate elements.

Classes in java.util used by org.openide.util.lookup

Class and Description
Collection The root interface in the collection hierarchy.

Classes in java.util used by org.openide.util.lookup.implspi

Class and Description
Set A collection that contains no duplicate elements.