问需要多个JPanel来响应自己的鼠标点击事件

EN

PuzzleListener plist = new PuzzleListener();
JPanel puzzle_board = new JPanel(new GridLayout(4,4,5,5));
...
Square square1 = new Square("1");
Square square2 = new Square("2");
...
puzzle_board.add(square1);
puzzle_board.add(square2);
...
square1.addMouseListener(plist);
square1.addMouseListener(plist);

class PuzzleListener implements MouseListener
    {

 public void mouseClicked(MouseEvent e)
 {
       JPanel pnlClick = (JPanel)(e.getSource());
       //System.out.println(pnlClick);
  //System.out.println(e.getSource());
  //System.out.println(e.getComponent().getClass());
  //System.out.println(e.getComponent().getClass().getName());


            //problem is here

  if(pnlClick == square1)
  {
   System.out.println("Panel 1 has been clicked");
  }    
            if(pnlClick == square2)
  {
   System.out.println("Panel 2 has been clicked");
  }       
 }
 public void mouseExited(MouseEvent e)
 {
 }
 public void mouseEntered(MouseEvent e)
 { 
  //System.out.println("Panel 1 has been clicked");
 }
 public void mouseReleased(MouseEvent e)
 {
 }
 public void mousePressed(MouseEvent e)
 {

 }
 /*
 public void actionPerformed(ActionEvent e)
 {
  JPanel pnlClick = (JPanel)(e.getSource());
 }*/

}//end calcListener