How to write such an event, so that a button corresponding to a roll board, click the button to display the corresponding roll plate

// five function buttons to set the event listeners btn_linkman.addMouseListener (new MouseListener () {@ Overridepublic void mouseClicked (MouseEvent e) {// TODO Auto-generated method stubif (isclick) {isclick = isclick;! List_linkman.setVisible ( true);} else {list_friends.setVisible (true);} // QQLandFrm.this.repaint ();} consult experts wrote Why can not race the corresponding button display board