Thread_CallableAndFuture(线程池返回结果)

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package com.gzhs.zsd.thread;

import java.util.Random;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionService;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorCompletionService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

/**
* 线程池Callable与Future应用
*/
public class Thread_CallableAndFuture {

public static void main(String[] args) {    //线程池提交一个任务, 返回结果测试    //Thread_getFuture();    //线程池提交一组任务, 返回结果测试    Thread_CompletionService();}//线程提交并拿到Future返回结果public static void Thread_getFuture(){    //创建一个单独线程    ExecutorService thredPool =  Executors.newSingleThreadExecutor();    //线程池提交, 获取Future结果    Future<String> future =  thredPool.submit(new Callable<String>() {        @Override        public String call() throws Exception {            Thread.sleep(2000);            return "正常";        }    });    try {        System.out.println("等待检查结果： ");        System.out.println("拿到检查结果： " + future.get());    } catch (InterruptedException e) {        e.printStackTrace();    } catch (ExecutionException e) {        e.printStackTrace();    }}//线程池提交一组Callable任务, 采用take方法获取已完成的的一个Callable任务的Future结果public static void Thread_CompletionService(){    //创建一个10个大小的线程池    ExecutorService threadPool = Executors.newFixedThreadPool(10);    //采用CompletionService提交一组任务    CompletionService<Integer> completionService = new ExecutorCompletionService<Integer>(threadPool);    //循环提交10个人任务    for(int i = 1; i <= 10; i++){        final int task = i;        completionService.submit(new Callable<Integer>() {            @Override            public Integer call() throws Exception {                //随机等待                Thread.sleep(new Random().nextInt(10000));                return task;            }        });    }    System.out.println("等待检查结果： ");    //循环拿结果    for(int i = 1; i<= 10; i++){        Future<Integer> future = null;        try {            //如果，这里没拿到结果, 会一直等待之后， 拿到结果之后， 在往下执行            future = completionService.take();            System.out.println("拿到检查结果： " + future.get());        } catch (InterruptedException e) {            e.printStackTrace();        } catch (ExecutionException e) {            e.printStackTrace();        }    }}

}

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