961: Highlights

• If you want to make use of a menu bar, then create a subclass of the JMenuBar class then create instances of the JMenu and JMenuItem classes by instantiating the following patterns:

  JMenu menu = new JMenu("label");           
  JMenuItem menu item = new JMenuItem("label");       
  

  then connect together the menu bar, menus, and menu items by instantiating the following pattern:

  menu or menu bar.add(menu or menu item); 
  

  and then instantiate the following pattern:

  setJMenuBar(menu bar); 
  

• If you want to define a listener to handle the selection of menu items, then define an inner class of a JMenuBar class:

   class LocalActionListener implements ActionListener { 
    public void actionPerformed(ActionEvent e) { 
    JMenuItem jMenuItem = (JMenuItem)(e.getSource()); 
    // Determine item clicked and react here 
    }  
   }  
  

  and then add the listener to the menu item:

  menu item.addActionListener(new LocalActionListener()); 
  

• If you want to open a popup menu, then create a subclass of the JPopupMenu class, and then connect menu items to the popup menu by instantiating the following pattern:

  popup menu.add(menu item); 
  

• If you want to define a listener to handle the selection of popup menu items, then define an inner class of a JPopupMenu class:

  class LocalActionListener implements ActionListener {                  
   public void actionPerformed (ActionEvent e) {                         
    JMenuItem jMenuItem = (JMenuItem)(e.getSource()); 
    // Determine item clicked and react here 
   } 
  } 
  

• If you want to define a listener to handle a mouse click, popping up a popup menu, then define an inner class inside your applet or frame:

  class LocalMouseListener extends MouseAdapter {  
   parent class parent;  
   LocalMouseListener(parent class p) {parent = p;}  
   public void mouseClicked (MouseEvent e) { 
    // React to click here 
   }  
  }  
  

  and then add the listener to the appropriate component:

  component.addMouseListener(new LocalMouseListener(this));