java - ReboundPanel Inheritance -

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the happy face im using----)happyface.gifthis project wants me modify rebound program chapter such when mouse button clicked animation stops, , when clicked again animation resumes.
when click on screen moving smiley face, doesnt stop when click nor start again because couldnt stop smiley face moving doing wrong? here problem area.------) | 

private class reboundmouselistener implements mouselistener {      public void mouseclicked(mouseevent event) {         if (timer.isrunning())             timer.stop();         else             timer.start();         }     }      public void mouseentered(mouseevent event) {}     public void mouseexited(mouseevent event) {}     public void mousepressed(mouseevent event) {}     public void mousereleased(mouseevent event) {} }

here rest of code:

public class reboundpanel extends jpanel {     private final int width =300, height= 100;     private final int delay= 20, image_size=35;      private imageicon image;     private timer timer;     private int x, y, movex, movey;      //---------------------------------------------------------     //  sets panel,including timer animation.     //---------------------------------------------------------     public reboundpanel(){         timer= new timer(delay, new reboundlistener());         image= new imageicon("happyface.gif");          x=0;         y=40;         movex=movey=3;          setpreferredsize(new dimension(width, height));         setbackground(color.black);         timer.start();     }      //---------------------------------------------------------     //  draws image in current location.     //---------------------------------------------------------     public void paintcomponent(graphics page)     {         super.paintcomponent(page);         image.painticon(this, page, x, y);     }      //*********************************************************     //  represents action listener timer.     //*********************************************************     private class reboundlistener implements actionlistener     {         //--------------------------------------------------------         //  updates position of image , possibly direction         //  of movement whenever timer fires action event.         //--------------------------------------------------------         public void actionperformed(actionevent event)         {             x += movex;             y += movey;              if (x <=0 || x >= width-image_size)                 movex =movex * -1;              if (y <=0 || y >= height-image_size)                 movey = movey * -1;              repaint();               }     }      private class reboundmouselistener implements mouselistener {         //--------------------------------------------------------------         //  stops or starts timer (and therefore animation)         //  when mouse button clicked.         //--------------------------------------------------------------         public void mouseclicked(mouseevent event) {             if (timer.isrunning())                 timer.stop();             else                 timer.start();         }          //--------------------------------------------------------------         //  provide empty definitions unused event methods.         //--------------------------------------------------------------         public void mouseentered(mouseevent event) {}         public void mouseexited(mouseevent event) {}         public void mousepressed(mouseevent event) {}         public void mousereleased(mouseevent event) {}     } } 
public class rebound {     public static void main(string[] args) {         jframe frame = new jframe("rebound");         frame.setdefaultcloseoperation(jframe.exit_on_close);         frame.getcontentpane().add(new reboundpanel());         frame.pack();         frame.setvisible(true);     } }

looks missing addmouselistener() calls:

public reboundpanel() {     // other initializations ...      addmouselistener(new reboundmouselistener());    // <-- add      timer.start(); }

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