使用线程池实现、线程进行异步计算

package com.yonyou.sci.gateway.exec;

import java.util.concurrent.Callable;

public class CallableTask<I extends Number> implements Callable<Integer> {

    private Integer num;

    public CallableTask () {}

    // 使用构造方式接收参数
    public CallableTask(Integer num){
        this.num = num;
    }

    @Override
    public Integer call () {
        Integer count = 0;
         for (int i = 1; i <= num;i++) {
             // 根据传入的参数，迭代相加
             count = count + i;
         }
        return count;
    }

}

package com.yonyou.sci.gateway.exec;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

/**
 * 使用线程池实现并行计算
 */
public class TaskMain {
    public static void main (String[] args) throws Exception{
        // 创建一个固定长度线程池
        ExecutorService es = Executors.newFixedThreadPool(2);

        // 使用线程池方式、执行线程子类
        Future<Integer> r1 = es.submit(new CallableTask<Integer>(100));
        Future<Integer> r2 = es.submit(new CallableTask<Integer>(200));

        // 获取到计算的结果并打印出来
        System.out.println(r1.get());
        System.out.println(r2.get());

        // 关闭线程池
        es.shutdown();

    }

}