## Uses of Interface
java.util.function.Predicate

- Packages that use Predicate
  Package | Description
  --- | ---
  java.util |
  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.

- - ### Uses of Predicate in java.util

    Methods in java.util with parameters of type Predicate
    Modifier and Type | Method and Description
    --- | ---
    `Optional<T>` | Optional.`filter(Predicate<? super T> predicate)` If a value is present, and the value matches the given predicate, returns an `Optional` describing the value, otherwise returns an empty `Optional`.
    `default boolean` | Collection.`removeIf(Predicate<? super E> filter)` Removes all of the elements of this collection that satisfy the given predicate.

  - ### Uses of Predicate in java.util.function

    Methods in java.util.function that return Predicate
    Modifier and Type | Method and Description
    --- | ---
    `default Predicate<T>` | Predicate.`and(Predicate<? super T> other)` Returns a composed predicate that represents a short-circuiting logical AND of this predicate and another.
    `static <T> Predicate<T>` | Predicate.`isEqual(Object targetRef)` Returns a predicate that tests if two arguments are equal according to `Objects#equals(Object, Object)`.
    `default Predicate<T>` | Predicate.`negate()` Returns a predicate that represents the logical negation of this predicate.
    `default Predicate<T>` | Predicate.`or(Predicate<? super T> other)` Returns a composed predicate that represents a short-circuiting logical OR of this predicate and another.

    Methods in java.util.function with parameters of type Predicate
    Modifier and Type | Method and Description
    --- | ---
    `default Predicate<T>` | Predicate.`and(Predicate<? super T> other)` Returns a composed predicate that represents a short-circuiting logical AND of this predicate and another.
    `default Predicate<T>` | Predicate.`or(Predicate<? super T> other)` Returns a composed predicate that represents a short-circuiting logical OR of this predicate and another.

  - ### Uses of Predicate in java.util.stream

    Methods in java.util.stream with parameters of type Predicate
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | Stream.`allMatch(Predicate<? super T> predicate)` Returns whether all elements of this stream match the provided predicate.
    `boolean` | Stream.`anyMatch(Predicate<? super T> predicate)` Returns whether any elements of this stream match the provided predicate.
    `Stream<T>` | Stream.`filter(Predicate<? super T> predicate)` Returns a stream consisting of the elements of this stream that match the given predicate.
    `boolean` | Stream.`noneMatch(Predicate<? super T> predicate)` Returns whether no elements of this stream match the provided predicate.
    `static <T> Collector<T,?,Map<Boolean,List<T>>>` | Collectors.`partitioningBy(Predicate<? super T> predicate)` Returns a `Collector` which partitions the input elements according to a `Predicate`, and organizes them into a `Map<Boolean, List<T>>`.
    `static <T,D,A> Collector<T,?,Map<Boolean,D>>` | Collectors.`partitioningBy(Predicate<? super T> predicate, Collector<? super T,A,D> downstream)` Returns a `Collector` which partitions the input elements according to a `Predicate`, reduces the values in each partition according to another `Collector`, and organizes them into a `Map<Boolean, D>` whose values are the result of the downstream reduction.

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