用于游戏循环的Java TimerTick事件 [英] Java TimerTick event for game loop

问题描述

我尝试使用java.util.Timer中的Timer在Java中进行游戏循环。在计时器滴答声中，我无法让我的游戏循环执行。以下是此问题的示例。我试图在游戏循环期间移动按钮，但它没有继续计时器滴答事件。

I tried making a game loop in Java using the Timer from java.util.Timer. I am unable to get my game loop to execute during the timer tick. Here is an example of this issue. I am trying to move the button during the game loop, but it is not moving on the timer tick event.

import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
import javax.swing.JButton;

public class Window extends JFrame {

    private static final long serialVersionUID = -2545695383117923190L;
    private static Timer timer;
    private static JButton button;

    public Window(int x, int y, int width, int height, String title) {

        this.setSize(width, height);
        this.setLocation(x, y);
        this.setTitle(title);
        this.setLayout(null);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setVisible(true);

        timer = new Timer();
        timer.schedule(new TimerTick(), 35);

        button = new JButton("Button");
        button.setVisible(true);
        button.setLocation(50, 50);
        button.setSize(120, 35);
        this.add(button);
    }

    public void gameLoop() {

        // Button does not move on timer tick.
        button.setLocation( button.getLocation().x + 1, button.getLocation().y );

    }

    public class TimerTick extends TimerTask {

        @Override
        public void run() {
            gameLoop();
        }
    }
}

推荐答案

由于这是一个Swing应用程序，不要使用java.util.Timer，而应使用javax.swing.Timer，也称为Swing Timer。

Since this is a Swing application, don't use a java.util.Timer but rather a javax.swing.Timer also known as a Swing Timer.

例如，

private static final long serialVersionUID = 0L;
private static final int TIMER_DELAY = 35;

构造函数中的

in the constructor

  // the timer variable must be a javax.swing.Timer
  // TIMER_DELAY is a constant int and = 35;
  new javax.swing.Timer(TIMER_DELAY, new ActionListener() {
     public void actionPerformed(ActionEvent e) {
        gameLoop();
     }
  }).start();

和

   public void gameLoop() {
      button.setLocation(button.getLocation().x + 1, button.getLocation().y);
      getContentPane().repaint(); // don't forget to repaint the container
   }

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