用于游戏循环的Java TimerTick事件

Question

我尝试使用java.util.Timer中的Timer在Java中创建游戏循环.在计时器滴答声期间,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.

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();
        }
    }
}

Answer 1

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

例如,

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

在构造函数中

  // 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
   }