利用线程池计算和

package com.oracle.demo05;

import java.util.concurrent.Callable;

public class MyCall implements Callable<Integer> {
    private int num1;
    private int num2;

    public MyCall(){}
            public MyCall(int num1,int num2){
                        this.num1=num1;
                        this.num2=num2;

                        }


    @Override
    public Integer call() throws Exception {
        int sum=0;
        for(int i=num1;i<=num2;i++){
        sum+=i;
        }
        return sum;
    }

}

package com.oracle.demo05;

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

public class demo01 {
//    用线程池计算1..100,1...200的和
    public static void main(String[] args) throws InterruptedException, ExecutionException {
        ExecutorService es=Executors.newFixedThreadPool(2);
        MyCall mc1=new MyCall(50,100);
        MyCall mc2=new MyCall(44,200);
//        让线程池自主选择一条线程执行线程任务
        Future<Integer>    f1=es.submit(mc1);
        Future<Integer>    f2=es.submit(mc2);
//        获取线程任务返回值
        int sum1=f1.get();
        int sum2=f2.get();
System.out.println(sum1);
System.out.println(sum2);


    }

}