Question

我试图根据我使用的箭头键让我的图像在屏幕上移动。现在它没有响应我按下的任何键。出于测试目的，我只尝试使用右箭头键。当按下按键时，如何让图像响应？这就是我到目前为止所做的：

import java.applet.Applet; 
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//import java.awt.event.ActionEvent;
//import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;


public class EC extends Applet{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    int x=50;
    int y=50;
    int dx,dy;
    public void keyPressed(KeyEvent e)
    {
        int keyCode = e.getKeyCode();
        if(keyCode==KeyEvent.VK_RIGHT)
        {
            dx=1;
            x+=dx;
        }
    }
    public void keyReleased(KeyEvent e)
    {
        int keyCode = e.getKeyCode();
        if(keyCode==KeyEvent.VK_RIGHT)
        {
            dx=0;
        }
    }
    public void paint(Graphics g)
    {
        g.drawImage(IllustrationManager.player[0][0],x,y,null);
    }


}

Answer 1

有关使用KeyListener的问题以及使用Key Bindings的更好解决方案，请参阅Motion Using the Keyboard。

Answer 2

@Override
public void init(){
   addKeyListener(new KeyAdapter(){
       public void keyPressed(KeyEvent e)
       {
          int keyCode = e.getKeyCode();
          if(keyCode==KeyEvent.VK_RIGHT)
          {
              dx=1;
              x+=dx;
              this.repaint(); // forgot this initially
          }
       }
   });

}

用箭头键控制图像

2 个答案: