java键盘监视有关问题

package person.move;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;  import javax.swing.*; public class KeyListener1 extends   JFrame implements   ActionListener   {    public JButton b1=new JButton("确定");      public int x;    public int y;    public JPanel jpanel=new JPanel();    public    JFrame frame = new JFrame("键盘响应");    public void _int()        { this.x=110;    this.y=180;             frame.setLocation(300, 300);         frame.setSize(300, 300);         frame.setResizable(false);         frame.setVisible(true);         frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);                  frame.setContentPane(jpanel);         jpanel.setBackground(Color.GREEN);                  jpanel.setLayout(null);         jpanel.add(b1);                   b1.setBounds(this.x, this.y, 80, 25);                  b1.addActionListener(this);          //addMouseListener(new Move().m);                          jpanel.setFocusable(true);         jpanel.addKeyListener(new KeyAdapter(){             public void keyPressed(KeyEvent e){                             if(e.getKeyCode()==KeyEvent.VK_RIGHT)                      b1.setBounds(++x, y, 80, 25);                           if(e.getKeyCode()==KeyEvent.VK_LEFT)                      b1.setBounds(--x,y, 80, 25);                    if(e.getKeyCode()==KeyEvent.VK_UP)                      b1.setBounds(x,--y, 80, 25);                   if(e.getKeyCode()==KeyEvent.VK_DOWN)                      b1.setBounds(x,++y, 80, 25);                            }         });         }                 public static void main(String[] args){         KeyListener1 move=new KeyListener1();                  move._int();               }     @Override    public void actionPerformed(ActionEvent e) {        // TODO Auto-generated method stub            }}