多线程之Callable

多线程实现Callable的好处有三点

1、Callable支持泛型

2、Callable支持返回值

3、Callable可以抛出异常

class MyThread2 implements Callable {
    public String name;

    public MyThread2(String name) {
        this.name = name;
    }

    @Override
    public Object call() throws Exception {
        for (int i = 0; i < 4; i++) {
            System.out.println("这是线程" + this.name + "：" + i);
        }
        return name + "执行完成";
    }
}

public class ThreadDemo {
    public static void main(String[] args) {
        MyThread2 myThread1 = new MyThread2("线程A");
        MyThread2 myThread2 = new MyThread2("线程B");
        FutureTask futureTask1 = new FutureTask(myThread1);
        FutureTask futureTask2 = new FutureTask(myThread2);
        new Thread(futureTask1).start();
        new Thread(futureTask2).start();
        try {
            Object o1 = futureTask1.get();
            System.out.println(o1);
            Object o2 = futureTask2.get();
            System.out.println(o2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }

    }
}