CompletableFuture实现子线程异步策略

package com.trpc.netty;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;

/**
 * 异步阻塞子线程，获取结果
 */
public class MyCompletableFuture {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //1定义一个 CompletableFuture 泛型 Integer
        CompletableFuturecompletableFuture=new CompletableFuture<>();
        
        System.out.println("启动一个子线程");
        //2创建一个子线程
        new Thread( ()->{
            try {
                //睡眠五秒钟
                for (int i = 5; i >0; i--) {
                    Thread.sleep(1000);
                    System.err.println("倒计时："+i);
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            int i=999;
                //将i结果通过complete返回
            completableFuture.complete(i);
        }).start();//启动子线程

        System.out.println("主线程执行到这阻塞住了");

        //通过get方法获取五秒钟后的值，但是get方法是阻塞的
        Integer integer = completableFuture.get();
        System.out.println("integer = " + integer);
    }
}