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);
}

}