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

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import org.junit.Test;

import java.util.function.Function;

import java.util.stream.Stream;

/**

* @author heks

* @description: TODO

* @date 2020/11/11

public class FunctionTest {

/**

* Function测试，function的作用是转换，将一个值转为另外一个值

@Test

public void test_Function() {

//① 使用map方法，泛型的第一个参数是转换前的类型，第二个是转化后的类型

Function<String, Integer> function = new Function<String, Integer>() {

@Override

public Integer apply(String s) {

return s.length();//获取每个字符串的长度，并且返回

}

};

Stream<String> stream = Stream.of("aaa", "bbbbb", "ccccccv");

Stream<Integer> stream1 = stream.map(function);

stream1.forEach(System.out::println);

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

System.out.println(function.apply("heks"));

}

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