我正在编写“谁想成为百万富翁”游戏,并且我已完成所有设置,这只是计时器的问题.

游戏的工作方式如下：如果用户正确回答了问题,他/她便会继续前进.如果不是,则游戏结束,他们可以选择再次玩.

游戏首次运行时,一切正常,计时器执行应做的事情-从30秒开始,倒计时,显示秒数.

但是,当用户单击“再次播放”按钮时,先前的计时器将继续使用新的计时器.像这样：

-timerA在用户迷路之前还剩20秒(由a表示).

-timerB在下一次玩游戏时开始(由b表示).

输出：20a 29b 19a 28b 18a 27b 17a 26b ……. 2a 11b 1a 10b 9b 8b 7b 6b 5b 4b 3b 2b 1b

所以这是我的计时器类CountDown：

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

  public class CountDown {

      static Timer timer;
      public static int seconds = 30;

      public CountDown() {
          timer = new Timer();
          timer.schedule(new DisplayCountdown(), 0, 1000);
      }

      class DisplayCountdown extends TimerTask {

          int seconds = 30;

          public void run() {

                  if (seconds == 0) {
                      timer.cancel();
                      timer.purge();
                      return;
                  }

              if (seconds > 0) {
                  PlayFrame.timer.setText("" + seconds); //jLabel used to display seconds
                  seconds--;
                  if (seconds < 30) {
                      if (PlayFrame.right == true) { //check if question was answered correctly
                          System.out.print("true"); //testing purposes
                          PlayFrame.right = false;
                          PlayFrame.showQuestion();
                          PlayFrame.startTimer();
                          seconds = 0;
                          //break;
                      }
                      else if (PlayFrame.right == false) {
                          //break;
                      }
                  }      

                  else if (seconds == 0) { //if time runs out its automatic wrong answer
                      PlayFrame.wrong();
                      //break;
                  }      

                  else {
                      PlayFrame.wrong();
                      PlayFrame.timer.setText(null);
                      timer = new Timer();
                      //break;
                  }
              }
              System.out.println(seconds); // for testing purposes only
          }
      }
  }

这是我的一些PlayFrame：

  import java.awt.Color;
  import java.util.Timer;

  public class PlayFrame extends javax.swing.JFrame {

      public static void wrong() {
          //determines which losing frame to show
          if (count <= 2){
              LossLevel0 L0 = new LossLevel0();
              L0.setVisible(true);
          }
          else if (count > 2 && count <= 6 && count != 6){
              LossLevel1 L1 = new LossLevel1();
              L1.setVisible(true);
          }
          else {
              LossLevel1 L1 = new LossLevel1();
              L1.setVisible(true);
          }
          //"supposed" to stop the timer
          CountDown.timer.cancel();
          CountDown.timer.purge();
      }

      public static void startTimer() {
          //creates new CountDown object and timer, also resets seconds
          CountDown countdown = new CountDown();
          CountDown.timer = new Timer();
          CountDown.seconds = 30;
      }

我认为问题可能出在我重新启动游戏时.唯一的代码是我在游戏开始之前将所有变量重置为原始状态.像这样：

    // Reset Everything
    PlayFrame.count = 0;
    PlayFrame.answer = new String();
    PlayFrame.count = 0;
    PlayFrame.right = false;
    PlayFrame.winnings = 0;
    CountDown.seconds = 30;
    CountDown.timer = new Timer();
    CountDown.timer.cancel();
    CountDown.timer.purge();

请帮助,如果您需要更多信息,请询问！

解决方法:

您不应该在Swing应用程序中使用java.util.Timer.对于这些,您应该使用javax.swing.Timer,因为这将尊重Swing事件线程.因此,您的问题尚无定论,我建议您将所有计时代码都扔掉,然后尝试使用适当的计时器.您可以在这里找到教程：Swing Timer Tutorial

接下来,您将要摆脱代码正在使用的所有静态方法和字段,并将其更改为实例字段和方法.

Swing计时器的示例显示JLabel中的剩余时间：

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class TimerExample {

   private static void createAndShowGui() {
      Gui mainPanel = new Gui();

      JFrame frame = new JFrame("TimerExample");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

class Gui extends JPanel {
   private static final long serialVersionUID = 1L;
   private static final String PRESS_BUTTON = "Press Button ";
   private static final String PRESS_BUTTON_AGAIN = "Press Button Again Within %02d Seconds!";
   private static final String YOU_LOSE = "You Lose!";
   private static final String YOU_WIN = "You Win!";
   private static final int PREF_W = 250;
   private static final int PREF_H = 100;
   private static final int TOTAL_SECONDS = 20;
   private static final int ONE_SECOND = 1000;

   private int elapsedSeconds = 0;
   private JLabel timerLabel = new JLabel(PRESS_BUTTON);
   private JButton button = new JButton("Button");
   private Timer myTimer;

   public Gui() {
      JPanel btnPanel = new JPanel();
      btnPanel.add(button);

      setLayout(new BorderLayout());
      add(btnPanel, BorderLayout.CENTER);
      add(timerLabel, BorderLayout.SOUTH);

      button.addActionListener(new ActionListener() {

         @Override
         public void actionPerformed(ActionEvent arg0) {
            if (myTimer != null && myTimer.isRunning()) {
               myTimer.stop();
               myTimer = null;
               timerLabel.setText(YOU_WIN);               
            } else {
               elapsedSeconds = 0;
               myTimer = new Timer(ONE_SECOND, new TimerListener());
               myTimer.start();
               String text = String.format(PRESS_BUTTON_AGAIN, TOTAL_SECONDS); 
               timerLabel.setText(text);
            }
         }
      });
   }

   @Override
   public Dimension getPreferredSize() {
      return new Dimension(PREF_W, PREF_H);
   }

   private class TimerListener implements ActionListener {
      @Override
      public void actionPerformed(ActionEvent e) {
         elapsedSeconds++;

         if (elapsedSeconds == TOTAL_SECONDS) {
            myTimer.stop();
            timerLabel.setText(YOU_LOSE);
         } else {
            String text = String.format(PRESS_BUTTON_AGAIN, TOTAL_SECONDS - elapsedSeconds);
            timerLabel.setText(text );
         }
      }
   }
}