CompletableFuture并行异步处理类使用示例

等待所有任务执行完, 串行执行和异步执行的高级写法: 

package com.zhangxueliang.demo.springbootdemo.JUC.c_026_01_ThreadPool;

import java.util.Random;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

/**
 * @ProjectName springbootdemo_src
 * @ClassName T06_01_CompletableFuture
 * @Desicription TODO
 * @Author Zhang Xueliang
 * @Date 2019/12/5 16:13
 * @Version 1.0
 **/
public class T06_01_CompletableFuture {


    public static void main(String[] args) {
        long start,end;
        start=System.currentTimeMillis();
        /*priceOfJD();
        priceOfTB();
        priceOfTM();*/
        CompletableFuture<Double> priceOfTM = CompletableFuture.supplyAsync(() -> priceOfTM());
        CompletableFuture<Double> priceOfJD = CompletableFuture.supplyAsync(() -> priceOfJD());
        CompletableFuture<Double> priceOfTB = CompletableFuture.supplyAsync(() -> priceOfTB());
        CompletableFuture.allOf(priceOfJD,priceOfTB,priceOfTM).join();

        end=System.currentTimeMillis();
        System.out.println(end-start);
    }


    private static double priceOfTM() {
        delay();
        return 1.00;
    }

    private static double priceOfTB() {
        delay();
        return 2.00;
    }

    private static double priceOfJD() {
        delay();
        return 3.00;
    }

    private static void delay() {
        int time = new Random().nextInt(500);
        try {
            TimeUnit.MILLISECONDS.sleep(time);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.printf("After %s sleep!\n", time);
    }

}

Completable好玩的API:

package com.zhangxueliang.demo.springbootdemo.JUC.c_026_01_ThreadPool;

import java.util.Random;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

/**
 * @ProjectName springbootdemo_src
 * @ClassName T06_01_CompletableFuture
 * @Desicription TODO
 * @Author Zhang Xueliang
 * @Date 2019/12/5 16:13
 * @Version 1.0
 **/
public class T06_01_CompletableFuture {


    public static void main(String[] args) {
        CompletableFuture.supplyAsync(()->priceOfJD()).thenApply(String::valueOf).thenApply(str->"price "+str).thenAccept(System.out::println);
        while (true){}
  
    }


    private static double priceOfTM() {
        delay();
        return 1.00;
    }

    private static double priceOfTB() {
        delay();
        return 2.00;
    }

    private static double priceOfJD() {
        delay();
        return 3.00;
    }

    private static void delay() {
        int time = new Random().nextInt(500);
        try {
            TimeUnit.MILLISECONDS.sleep(time);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.printf("After %s sleep!\n", time);
    }

}