Package | Description |
---|---|
java8.util |
Provides some of the new
java.util classes and implementations
of static and default interface methods added in Java 8. |
java8.util.function |
Functional interfaces provide target types for lambda expressions
and method references.
|
java8.util.stream |
Classes to support functional-style operations on streams of elements, such
as map-reduce transformations on collections.
|
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,
return an
Optional describing the value, otherwise return an
empty Optional . |
Modifier and Type | Method and Description |
---|---|
static <T> Predicate<T> |
Predicates.and(Predicate<? super T> this_,
Predicate<? super T> other)
Returns a composed predicate that represents a short-circuiting logical
AND of the
this_ predicate and another. |
static <T> Predicate<T> |
Predicates.isEqual(Object targetRef)
Returns a predicate that tests if two arguments are equal according
to
Objects.equals(Object, Object) . |
static <T> Predicate<T> |
Predicates.negate(Predicate<? super T> this_)
Returns a predicate that represents the logical negation of the
this_
predicate. |
static <T> Predicate<T> |
Predicates.or(Predicate<? super T> this_,
Predicate<? super T> other)
Returns a composed predicate that represents a short-circuiting logical
OR of the
this_ predicate and another. |
Modifier and Type | Method and Description |
---|---|
static <T> Predicate<T> |
Predicates.and(Predicate<? super T> this_,
Predicate<? super T> other)
Returns a composed predicate that represents a short-circuiting logical
AND of the
this_ predicate and another. |
static <T> Predicate<T> |
Predicates.and(Predicate<? super T> this_,
Predicate<? super T> other)
Returns a composed predicate that represents a short-circuiting logical
AND of the
this_ predicate and another. |
static <T> Predicate<T> |
Predicates.negate(Predicate<? super T> this_)
Returns a predicate that represents the logical negation of the
this_
predicate. |
static <T> Predicate<T> |
Predicates.or(Predicate<? super T> this_,
Predicate<? super T> other)
Returns a composed predicate that represents a short-circuiting logical
OR of the
this_ predicate and another. |
static <T> Predicate<T> |
Predicates.or(Predicate<? super T> this_,
Predicate<? super T> other)
Returns a composed predicate that represents a short-circuiting logical
OR of the
this_ predicate and another. |
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. |
Copyright © 2015. All rights reserved.