一次提交10個任務去執行，任務執行完從future獲取結果

package com.brendan.cn.concurrent;

import java.util.Random;
import java.util.concurrent.*;
public class CallableAndFuture {

    public static void main(String[] args) {

        ExecutorService threadPool2 =  Executors.newFixedThreadPool(10);
        CompletionService<Integer> completionService = new
 
 ExecutorCompletionService<Integer>(threadPool2);
        for(int i=1;i<=10;i++){
            final int seq = i;
            completionService.submit(new Callable<Integer>() {
                @Override
                public Integer call() throws Exception {
                    Thread.sleep(new
 
 Random().nextInt(5000));
                    return seq;
                }
            });
        }
        for(int i=0;i<10;i++){
            try {
                System.out.println(completionService.take().get());
            }catch (Exception e) {
                // TODO Auto-generated catch block
 

                e.printStackTrace();
            }
        }


    }
}