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Java8函数式编程
在Java8的 java.util.function中包含以下几个接口
1、Function,先上源码
/* * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.util.function; import java.util.Objects; /** * Represents a function that accepts one argument and produces a result. * * <p>This is a <a href="http://www.mamicode.com/package-summary.html">functional interface</a> * whose functional method is {@link #apply(Object)}. * * @param <T> the type of the input to the function * @param <R> the type of the result of the function * * @since 1.8 */ @FunctionalInterface public interface Function<T, R> { /** * 将Function对象应用到输入的参数上,然后返回计算结果
* * @param t the function argument * @return the function result */ R apply(T t); /** * 返回一个先执行当前函数对象apply方法再执行after函数对象apply方法的函数对像. * * @param <V> the type of input to the {@code before} function, and to the * composed function * @param before the function to apply before this function is applied * @return a composed function that first applies the {@code before} * function and then applies this function * @throws NullPointerException if before is null * * @see #andThen(Function) */ default <V> Function<V, R> compose(Function<? super V, ? extends T> before) { Objects.requireNonNull(before); return (V v) -> apply(before.apply(v)); } /** * 返回一个先执行before函数对象apply方法再执行当前函数对象apply方法的函数对象 * @param <V> the type of output of the {@code after} function, and of the * composed function * @param after the function to apply after this function is applied * @return a composed function that first applies this function and then * applies the {@code after} function * @throws NullPointerException if after is null * * @see #compose(Function) */ default <V> Function<T, V> andThen(Function<? super R, ? extends V> after) { Objects.requireNonNull(after); return (T t) -> after.apply(apply(t)); } /** * 返回一个执行了apply()方法之后只会返回输入参数的函数对象. * * @param <T> the type of the input and output objects to the function * @return a function that always returns its input argument */ static <T> Function<T, T> identity() { return t -> t; } }
Java8函数式编程
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