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Thread: Menu Event Listeners

  1. #1
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    Default Menu Event Listeners

    I follows this. javax.swing.event.MenuListener - Menu Listener Interface


    And i keep getting this error. Note, i have not added it to the menu objects.

    Sorry for the long code guys!

    package interfacepkg;
     
     
    import javax.swing.*;
    import javax.swing.event.*;
     
    import java.awt.event.*;
    import java.awt.*;
    /**
     *
     * @author Josh Kruger
     */
    public class Main extends JFrame implements MenuListener{
     
       JTextField ClientName = new JTextField(20);
       JTextField DOB = new JTextField(9);
       JButton ok = new JButton("Ok");
       JButton Can = new JButton("Cancel");
     
     
       //--------------------------------------------------------------
     
       JMenuBar Tools = new JMenuBar();
     
     
     
       JMenu AddClients = new JMenu("Add Clients");
       JMenuItem addone = new JMenuItem("Add a Client");
     
     
       JMenu EditClients = new JMenu("Edit Clients");
       JMenuItem PickCurrent = new JMenuItem("Choose Client");
       JMenuItem EditHim = new JMenuItem("Edit Choosen Client");
       JMenuItem RemoveC = new JMenuItem("Remove a Client");
     
       JMenu Fresh = new JMenu("Advanced");
       JMenuItem reset = new JMenuItem("Reset Data");
       JMenuItem restart = new JMenuItem("Re-Build Pages");
     
     
     
       //-----------------------------------------------------------------
       public void Window1()
       {
     
     
           setTitle("Test Interface");
           setSize(400,150);
           setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
           AddClients.add(addone);
     
     
           EditClients.add(PickCurrent);
     
           EditClients.add(EditHim);
     
           EditClients.addSeparator();
           EditClients.add(RemoveC);
     
     
           Fresh.add(reset);
     
           Fresh.addSeparator();
           Fresh.add(restart);
     
     
           Tools.add(AddClients);
           Tools.add(EditClients);
           Tools.add(Fresh);
     
           setJMenuBar(Tools);
     
           GridLayout gridall = new GridLayout(3,3,5,8);
           JPanel pane = new JPanel();
           pane.setLayout(gridall);
     
     
           JLabel Name = new JLabel("Name: ");
           JLabel Date = new JLabel("Date of Birth");
     
           pane.add(Name);
           pane.add(ClientName);
           pane.add(Date);
           pane.add(DOB);
     
           pane.add(ok);
           pane.add(Can);
     
           add(pane);
           setVisible(true);
       }
     
       public void menuSelected(MenuEvent e) {
          JMenu myMenu = (JMenu) e.getSource();
          System.out.println("Menu Selected: "+myMenu.getText());
       }
     
     
     
     
       public void actionPeformed(ActionEvent evt)
       {
           Object source = evt.getSource();
     
           if(source == addone)
           {
               setTitle("addone worked");
           }
           repaint();
     
       }
     
     
        public static void main(String[] args) {
     
     
            Main Start = new Main();
            Start.Window1();
     
            // TODO code application logic here
        }
     
    }

    This is the error i get... (In the book java6 in 21 days, his examples, as well as the link implement fine)
    java.lang.ExceptionInInitializerError
    Caused by: java.lang.RuntimeException: Uncompilable source code -[B] interfacepkg.Main is not abstract and does not override abstract method menuCanceled(javax.swing.event.MenuEvent) in javax.swing.event.MenuListener[/B]
            at interfacepkg.Main.<clinit>(Main.java:18)
    Could not find the main class: interfacepkg.Main.  Program will exit.
    Exception in thread "main" Java Result: 1


    Thanks guys!!!

  2. The Following User Says Thank You to Gondee For This Useful Post:

    javapenguin (June 16th, 2010)


  3. #2
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    Default Re: Menu Event Listeners

    Well, for one, it means that your need a method menuCanceled(javax.swing.event.MenuEvent) in javax.swing.event.MenuListener

    Just like if you have your class do this:

    public class yourClass extends someClass implements ActionListener

    // lacks method actionPerformed.

    Will cause message saying that it isn't abstract and bla bla bla.

    Java 2 Platform SE v1.3.1: Interface MenuListener

    You need to define all of those methods or else you can't implement MenuListener.

  4. #3
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    Default Re: Menu Event Listeners

    package interfacepkg;
     
     
    import javax.swing.*;
    import javax.swing.event.*;
     
    import java.awt.event.*;
    import java.awt.*;
    /**
     *
     * @author Josh Kruger
     */
    public class Main extends JFrame implements MenuListener
    { // beginning of class
     
       JTextField ClientName = new JTextField(20);
       JTextField DOB = new JTextField(9);
       JButton ok = new JButton("Ok");
       JButton Can = new JButton("Cancel");
     
     
       //--------------------------------------------------------------
     
       JMenuBar Tools = new JMenuBar();
     
     
     
       JMenu AddClients = new JMenu("Add Clients");
       JMenuItem addone = new JMenuItem("Add a Client");
     
     
       JMenu EditClients = new JMenu("Edit Clients");
       JMenuItem PickCurrent = new JMenuItem("Choose Client");
       JMenuItem EditHim = new JMenuItem("Edit Choosen Client");
       JMenuItem RemoveC = new JMenuItem("Remove a Client");
     
       JMenu Fresh = new JMenu("Advanced");
       JMenuItem reset = new JMenuItem("Reset Data");
       JMenuItem restart = new JMenuItem("Re-Build Pages");
     
     
     
       //-----------------------------------------------------------------
       public void Window1()
       { // beginning of method
     
     
           setTitle("Test Interface");
           setSize(400,150);
           setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
           AddClients.add(addone);
     
     
           EditClients.add(PickCurrent);
     
           EditClients.add(EditHim);
     
           EditClients.addSeparator();
           EditClients.add(RemoveC);
     
     
           Fresh.add(reset);
     
           Fresh.addSeparator();
           Fresh.add(restart);
     
     
           Tools.add(AddClients);
           Tools.add(EditClients);
           Tools.add(Fresh);
     
           setJMenuBar(Tools);
     
           GridLayout gridall = new GridLayout(3,3,5,8);
           JPanel pane = new JPanel();
           pane.setLayout(gridall);
     
     
           JLabel Name = new JLabel("Name: ");
           JLabel Date = new JLabel("Date of Birth");
     
           pane.add(Name);
           pane.add(ClientName);
           pane.add(Date);
           pane.add(DOB);
     
           pane.add(ok);
           pane.add(Can);
     
           add(pane);
           setVisible(true);
       } // end of method
     
       public void menuSelected(MenuEvent e) {
          JMenu myMenu = (JMenu) e.getSource(); 
          System.out.println("Menu Selected: "+myMenu.getText());
       }
     
    public void menuDeselected(MenuEvent e) {
    // put code in here
    } 
     
    public void menuCanceled(MenuEvent e){
    // put code in here
    }
     
     
     
       public void actionPeformed(ActionEvent evt)
       {
           Object source = evt.getSource();
     
           if(source == addone)
           {
               setTitle("addone worked");
           }
           repaint();
     
       }
     
     
        public static void main(String[] args) {
     
     
            Main Start = new Main();
            Start.Window1();
     
            // TODO code application logic here
        }
     
    }

    This might help some.

  5. #4
    Member Faz's Avatar
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    Default Re: Menu Event Listeners

    JP if thanks were a stock you'd be crashing the market at your rate .

    But anyway onto the problem you need to override all the methods of the implemented class MenuListener like so

    		public void menuCanceled(MenuEvent e) 
    	{
    		//Your code here or just leave blank
    	}
     
     
     
    	public void menuDeselected(MenuEvent e) 
    	{
    		//Your code here or just leave blank
    	}

  6. #5
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    Default Re: Menu Event Listeners

    Well, I was having problems trying to figure out JMenu, and hsi code might work if it fixed that problem, so maybe I could study it and figure out those tricky JMenus. It looks like they need menuitems and lots of listeners.

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