如何让程序等到计时器线程完成后再继续？

Question

我正在做一个学习java的小程序，我想打印一些东西，等待几秒钟（通过打印显示......）然后继续该程序。我通过使用Timer和做到了这一点TimerTask。我想知道如何让程序的执行等到我的计时器线程结束。

我尝试timer.wait()在某些地方添加但不起作用。

public class Main

{

    public static void main(String[] args)

    {

        System.out.println("text1");

        clock currentClock = new clock();

        currentClock.run();

        // i want the program to stop until this is over, adding currentClock.wait(); doesnt work

        System.out.println("text2");

    }

}

class clockHelper extends TimerTask

{ // printing class, called by clock class

    int actual = 0;

    public void run()

    {

        if (actual < 3)

        {

            System.out.println(".");

            actual++;

        } else

        {

            cancel();

        }

    }

}

class clock

{ // called by main class

    public static void run()

    {

        Timer watch = new Timer();

        TimerTask timer2 = new clockHelper();

        watch.schedule(timer2, 1000, 500);

        // adding watch.wait(); doesn't work, i can also stop it here and it should work fine

    }

}

这是我得到的错误：java.lang.IllegalMonitorStateException

我想要的结果是打印这个：“text”。。。“文本2”

如果我删除wait（这会导致错误），则会打印： "text1" "text2" 。。。

在此先感谢您的任何信息。

Answer 1

你可以这样做：public class Main{&nbsp; &nbsp; public static void main(String[] args) throws InterruptedException&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; System.out.println("text1");&nbsp; &nbsp; &nbsp; &nbsp; for (int i = 0; i < 3; i++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; System.out.print(".");&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Thread.sleep(1000);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; System.out.println();&nbsp; &nbsp; &nbsp; &nbsp; System.out.println("text2");&nbsp; &nbsp; }}