java-base/java-8future/src/test/java/ConsumerTest.java at master · singgel/java-base · GitHub

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import org.junit.Test;

import java.util.function.Consumer;

import java.util.stream.Stream;

/**

* @author heks

* @description: TODO

* @date 2020/11/10

public class ConsumerTest {

/**

* consumer接口测试

@Test

public void test_Consumer() {

//① 使用consumer接口实现方法

Consumer<String> consumer = new Consumer<String>() {

@Override

public void accept(String s) {

System.out.println(s);

}

};

Stream<String> stream = Stream.of("aaa", "bbb", "ddd", "ccc", "fff");

stream.forEach(consumer);

System.out.println("********************");

//② 使用lambda表达式，forEach方法需要的就是一个Consumer接口

stream = Stream.of("aaa", "bbb", "ddd", "ccc", "fff");

Consumer<String> consumer1 = (s) -> System.out.println(s);//lambda表达式返回的就是一个Consumer接口

stream.forEach(consumer1);

//更直接的方式

//stream.forEach((s) -> System.out.println(s));

System.out.println("********************");

//③ 使用方法引用，方法引用也是一个consumer

stream = Stream.of("aaa", "bbb", "ddd", "ccc", "fff");

Consumer consumer2 = System.out::println;

stream.forEach(consumer);

//更直接的方式

//stream.forEach(System.out::println);

}

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