Java8中的常用函數式接口及例子

Java 8中的常用函數式接口 

函數式接口	函數描述符	原始類型特化
Predicate<T>	T->boolean	IntPredicate,LongPredicate, DoublePredicate
Consumer<T>	T->void	IntConsumer,LongConsumer, DoubleConsumer
Function<T,R>	T->R	IntFunction,
		IntToDoubleFunction,
		IntToLongFunction,
		LongFunction,
		LongToDoubleFunction,
		LongToIntFunction,
		DoubleFunction,
		ToIntFunction,
		ToDoubleFunction,
		ToLongFunction
Supplier<T>	()->T	BooleanSupplier,IntSupplier, LongSupplier,
		DoubleSupplier
UnaryOperator<T>	T->T	IntUnaryOperator,
		LongUnaryOperator,
		DoubleUnaryOperator
BinaryOperator<T>	(T,T)->T	IntBinaryOperator,
		LongBinaryOperator,
		DoubleBinaryOperator
BiPredicate<L,R>	(L,R)->boolean
BiConsumer<T,U>	(T,U)->void	ObjIntConsumer<T>,
		ObjLongConsumer<T>,
		ObjDoubleConsumer<T>
BiFunction<T,U,R>	(T,U)->R	ToIntBiFunction<T,U>,
		ToLongBiFunction<T,U>,
		ToDoubleBiFunction<T,U>

 

補充：

Lambdas及函數式接口的例子

使用案例	Lambda 的例子	對應的函數式接口
布爾表達式	(List list) -> list.isEmpty()	Predicate<list>
創建對象	() -> new Apple(10)	Supplier<Apple>
消費一個對象	(Apple a) -> System.out.println(a.getWeight())	Consumer<Apple>
從一個對象中 選擇/提取	(String s) -> s.length()	Function<string, integer="">或 ToIntFunction
合並兩個值	(int a, int b) -> a * b	IntBinaryOperator
比較兩個對象	(Apple a1, Apple a2) -> a1.getWeight().compareTo(a2.getWeight())	Comparator或 BiFunction<apple, apple,="" integer=""> 或 ToIntBiFunction<apple, apple="">