键盘事件

public class Keyboard extends JFrame implements KeyListener{
    JLabel I;
    
    Keyboard(String name){
        super(name);
        init();
    }
    
    public void init(){
        Toolkit tk = getToolkit();
        Dimension dm = tk.getScreenSize();
        setLocation((int)(dm.getWidth()-getWidth())/2,(int)(dm.getHeight()-getHeight())/2);
        
        JPanel pan = new JPanel();

        pan.setBackground(Color.YELLOW);
        pan.setLayout(new FlowLayout(FlowLayout.CENTER));
        
        I = new JLabel();
        I.setText("键盘事件处理");
        
        pan.add(I);
        this.add(pan);
        
        this.addKeyListener(this);
    }
    
    //敲击
    public void keyTyped(KeyEvent e){
        
    }
    
    //按下
    public void keyPressed(KeyEvent e){
        I.setText("你刚才敲的字母是"+e.getKeyCode()+"  " + e.getKeyChar());
    }
    
    //释放
    public void keyReleased(KeyEvent e){
        I.setText("key up");
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Keyboard f = new Keyboard("test");
        
        f.pack();
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

}