java - 如何正确重新启动 java.util.Timer？

Question

首先，我对编程有点陌生，所以所有帮助将不胜感激。我得到了这段代码，其中使用了 java.util.timer，我想在单击某个按钮后重新启动计时器。 当我第一次打开游戏时，计时器就会开始计时，40秒后会出现一条消息，并且游戏中除“开始”和“结束”按钮之外的所有按钮都将被禁用。现在我的问题是，成功清理和清除计时器后如何重新启动计时器？

public AntInking_GUI() { 
    timerStart();
}
public void startButton() {
    // start button, re-generates a new pattern and re-news the time
    enableButtons();
    timerStart();
    timerSeconds = 0;
    timeLeft = 40;

public void timerStart() {
    // timer that counts from 40 to 0, if it reaches 0 then the game will
    // end and the buttons will be disabled

    TimerTask task = new TimerTask() {

        public void run() {

            timerSeconds++;
            timeLeft = 40 - timerSeconds;
            changeText();
            if (timerSeconds >= 40) {
                showTextEnd();
                pause();
                gametimer.purge();
                gametimer.cancel();

            }
        }
    };

    if (isGameRunning == false) {

        gametimer.scheduleAtFixedRate(task, 1000, 1000);
        isGameRunning = true;
    }

正如你所看到的，计时器将停止，但我无法创建新的计时器。 提前致谢!

Answer 1

您必须分配一个新的计时器实例。例如，见下文:

import java.util.Timer;
import java.util.TimerTask;

public class Main {
    private static Timer timer;

    public static void main(String[] args) throws InterruptedException {
        Main main = new Main();
        main.launchSomeTimer("john doe");

        Thread.sleep(5000);
        main.resetSomeTimer();

        Thread.sleep(10000);
        timer.cancel();


    }

    private void launchSomeTimer(String name) {
        TimerTask timerTask = new TimerTask() {

            @Override
            public void run() {
                System.out.println("name: " + name);
            }
        };
        timer = new Timer();
        timer.schedule(timerTask, 500);

    }

    public void resetSomeTimer() {
        TimerTask timerTask = new TimerTask() {

            @Override
            public void run() {
                System.out.println("updating timer");
            }
        };
        timer.cancel();
        timer = new Timer();
        timer.schedule(timerTask, 1000);

    }
}