implements KeyListener但关键监听器监听少

今天写的游戏。主要听众，但它并不总是加入了育雏，

我实现了接口，但不听

后来，我发现只是没想到服用口服细致怎么称呼控制panel上面增加了一个addKeyListener(this);

基础不坚固。马虎

其次我有在其它的程序里測试发现方法都写了也不行：后来比較了一下少了个

this.setFocusable(true);

网上一查才知道还须要获取焦点。伙伴们你们知道了么？

将控件设置成可获取焦点状态。默认是无法获取焦点的，仅仅有设置成true，才干获取控件的点击事件

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;





import javax.swing.JFrame;

import javax.swing.JPanel;









public class mainFrame extends JFrame {

private KeyboardPanel keyboardPanel =new KeyboardPanel();

public mainFrame(){

add(keyboardPanel);

keyboardPanel.setFocusable(true);



}

public static void main(String [] args){

mainFrame frame = new mainFrame();

frame.setTitle("mainFrame");

frame.setSize(300,300);

frame.setLocationRelativeTo(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

}

static class KeyboardPanel extends JPanel implements KeyListener{

private int x=100;

private int y=100;

private char keyChar = 'A';

public KeyboardPanel(){

setBackground(Color.cyan);

addKeyListener(this);

/*addKeyListener(new KeyAdapter(){

public void keyPressed(KeyEvent e){

switch (e.getKeyCode()){

case KeyEvent.VK_DOWN: 



y+=10;

break;

case KeyEvent.VK_UP:

y-=10;

break;

case KeyEvent.VK_LEFT:

x-=10;

break;

case KeyEvent.VK_RIGHT:

x+=10;

break;

default:

keyChar=e.getKeyChar();

}

//repaint();

}





});*/

}



   protected void paintComponent(Graphics g){

  super.paintComponent(g);

  g.setFont(new Font("TimesRoman",Font.PLAIN,40));

  g.drawString(String.valueOf(keyChar), x, y);

   }





@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

switch (e.getKeyCode()){

case KeyEvent.VK_DOWN: 





y+=10;

break;

case KeyEvent.VK_UP:

y-=10;

break;

case KeyEvent.VK_LEFT:

x-=10;

break;

case KeyEvent.VK_RIGHT:

x+=10;

break;

default:

keyChar=e.getKeyChar();

}

repaint();

}





@Override

public void keyReleased(KeyEvent e) {

// TODO Auto-generated method stub



}





@Override

public void keyTyped(KeyEvent e) {

// TODO Auto-generated method stub



}

}

}

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