JUC个人学习笔记5--Callable

根据b站UP主狂神说JUC课程所写的个人学习笔记

视频地址：https://www.bilibili.com/video/BV1B7411L7tE?from=search&seid=14761503393031794075

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 1.可以有返回值

2.可以抛出异常

3.方法不同 run(),call()

4.代码测试

 

public class CallableTest {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //new Thread(new MyThread()).start();

        new Thread().start();//怎么启动callable
        MyThread thread = new  MyThread();
        //适配类
        FutureTask futureTask = new FutureTask(thread);
        new Thread(futureTask).start();
        String o = (String) futureTask.get();//获取callable的返回结果
        System.out.println(o);

    }
}
class MyThread implements Callable<String> {


    @Override
    public String call() throws Exception {
        System.out.println("call()");
        return "123";
    }
}

细节：

1.有缓存

2.结果可能需要等待，会阻塞