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Java8 Supplier接口和Consumer接口原理代码解析
时间:2020-04-28 编辑:袖梨 来源:一聚教程网
本篇文章小编给大家分享一下Java8 Supplier接口和Consumer接口原理代码解析,文章代码介绍的很详细,小编觉得挺不错的,现在分享给大家供大家参考,有需要的小伙伴们可以来看看。
Supplier接口
package java.util.function; /** * Represents a supplier of results. * *There is no requirement that a new or distinct result be returned each * time the supplier is invoked. * *
This is a functional interface * whose functional method is {@link #get()}. * * @param
the type of results supplied by this supplier * * @since 1.8 */ @FunctionalInterface public interface Supplier { /** * Gets a result. * * @return a result */ T get(); }
supplier接口只有一个抽象方法get(),通过get方法产生一个T类型实例。
实例:
package me.yanand; import java.util.function.Supplier; public class TestSupplier { public static void main(String[] args) { SupplierappleSupplier = Apple::new; System.out.println("--------"); appleSupplier.get(); } } class Apple{ public Apple() { System.out.println("创建实例"); } }
Consumer接口
package java.util.function; import java.util.Objects; /** * Represents an operation that accepts a single input argument and returns no * result. Unlike most other functional interfaces, {@code Consumer} is expected * to operate via side-effects. * *This is a functional interface * whose functional method is {@link #accept(Object)}. * * @param
the type of the input to the operation * * @since 1.8 */ @FunctionalInterface public interface Consumer { /** * Performs this operation on the given argument. * * @param t the input argument */ void accept(T t); /** * Returns a composed {@code Consumer} that performs, in sequence, this * operation followed by the {@code after} operation. If performing either * operation throws an exception, it is relayed to the caller of the * composed operation. If performing this operation throws an exception, * the {@code after} operation will not be performed. * * @param after the operation to perform after this operation * @return a composed {@code Consumer} that performs in sequence this * operation followed by the {@code after} operation * @throws NullPointerException if {@code after} is null */ default Consumer andThen(Consumer super T> after) { Objects.requireNonNull(after); return (T t) -> { accept(t); after.accept(t); }; } }
实例:
package me.yanand; import java.util.function.Consumer; public class TestConsumer { public static void main(String[] args) { Consumerconsumer = (t) -> { System.out.println(t*3); }; Consumer consumerAfter = (s) -> { System.out.println("之后执行:"+s); }; consumer.andThen(consumerAfter).accept(5); } }
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