【多线程实现方案三：实现Callable 接口】

package com.test;

import java.util.concurrent.Callable;

public class MyCallable implements Callable<Integer> {

    private int number;

    public MyCallable(int number){
        this.number = number;
    }

    @Override
    public Integer call() throws Exception {
        int sum = 0;

        for(int x=1;x<=number;x++){
            sum +=x;
        }

        return sum;
    }
}

package com.test;

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

public class CallableTest {

    public static void main(String[] args) throws
            InterruptedException, ExecutionException {

        /**创建线程池对象*/
        ExecutorService pool = Executors.newFixedThreadPool(2);

        /**可以执行Runnable对象或者Callable对象代表的线程*/
        Future<Integer> f1 = pool.submit(new MyCallable(100));
        Future<Integer> f2 = pool.submit(new MyCallable(200));

        /**V get()*/
        Integer i1 = f1.get();
        Integer i2 = f2.get();
        System.out.println(i1);
        System.out.println(i2);

        /**结束*/
        pool.shutdown();

    }

}

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