FutureTask创建Future

本文演示通过FutureTask去创建Future.

概述

  我们通过类图去说明FutureTask,见下图所示

  

 

FutureTask实例

  下面我们通过一个代码去演示FutureTask用法,见下图所示:

  

package com.yang.callable;

import java.util.concurrent.*;

public class FutureTaskDemo {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        ExecutorService executorService = Executors.newFixedThreadPool(2);
        FutureTask<Integer> futureTask = new FutureTask<>(new Task());
        executorService.submit(futureTask);
        System.out.println(futureTask.get());
        executorService.shutdown();
    }

    static class Task implements Callable<Integer> {
        @Override
        public Integer call() throws Exception {
            int num = 0;
            for (int i = 0; i < 10000; i++) {
                num = num + i;
            }
            return num;
        }
    }
}

  运行结果如下:

  

 

posted @ 2020-04-26 15:25  cnxieyang  阅读(352)  评论(0编辑  收藏  举报
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