package com.vipsoft.demo;

import org.junit.jupiter.api.Test;

public class AnonymousFunction {

    //1.定义一个函数式接口。只有一个抽象方法的接口就是函数式接口
    interface ILike {
        void hit(long param);
    }

    @Test
    void testAnonymous() throws Exception {

        //匿名内部类，没有类名称，必须借助接口
        ILike like = new ILike() {
            @Override
            public void hit(long param) {
                System.out.println("i like anonymous => " + param);
            }
        };

        for (int i = 0; i < 10; i++) {
            like.hit(System.currentTimeMillis());
            Thread.sleep(1000);
        }
    }

    @Test
    void testLambda() throws Exception {

        // 用lambda简化，因为接口中只有一个函数，所以可以直接省略实例化的接口名和函数名
        ILike like = (param) -> {
            System.out.println("i like lambda => " + param);
        };

        for (int i = 0; i < 10; i++) {
            like.hit(System.currentTimeMillis());
            Thread.sleep(1000);
        }
    }



    interface PrintInfo {
        void print(String data);
    }

    static void printJob(PrintInfo printInfo, String data) {
        printInfo.print(data);
    }

    @Test
    void testLambda2() {
        printJob(statement -> System.out.println("We're learning " + statement), "Lambda");
    }
}