多线程之带返回值的Callable使用

1.Thread类可以传入Runnable接口，而FutureTask实现了Runnable接口，并且构造参数为Callable

package com.atgu;

import java.util.concurrent.*;

class MyCallable implements Callable{
    @Override
    public Integer call() throws Exception {
        System.out.println("进入了call()方法。。。。");
        return 1024;
    }
}
public class CallableDemo {

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        FutureTask futureTask = new FutureTask(new MyCallable());

        new Thread(futureTask,"aaa").start();
        System.out.println(futureTask.get());//获得返回值

    }
}