JUC concurrent programming Callable (7)

 1. There is a return value

2. Can throw exceptions

3. Different methods, run()/call()

package com.xizi.callable;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class callable {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
//        new Thread(new Runnable() {}).start();
//        new Thread(new FutureTask<V>()).start();
//        new Thread(new FutureTask<V>( Callable)).start();

        MyThread thread = new MyThread();
        FutureTask futureTask = new FutureTask(thread);
        new Thread(futureTask,"A").start();
        new Thread(futureTask,"").start();//结果会被缓冲，效率高
        //获取Callable返回结果
        //get 方法可能结构阻塞B
        Integer integer = (Integer) futureTask.get();
        System.out.println(integer);
    }
}
class MyThread implements Callable<Integer>{
    @Override
    public Integer call() throws Exception {
        System.out.println("执行call方法");
        return 65486;
    }
}