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package com.hks.lambda;

import org.junit.Test;

import java.util.stream.Collectors;

import java.util.stream.Stream;

public class PeekTest {

/**

* forEach 是 terminal 操作，因此它执行后，Stream 的元素就被“消费”掉了，你无法对一个 Stream 进行两次 terminal 运算。

*

* 相反，具有相似功能的 intermediate 操作 peek 可以达到上述目的。

*/

@Test

public void foreachPeekTest(){

Stream.of("one", "two", "three", "four")

.filter(e -> e.length() > 3)

.peek(e -> System.out.println("Filtered value: " + e))

.map(String::toUpperCase)

.peek(e -> System.out.println("Mapped value: " + e))

.collect(Collectors.toList());

}

}