Thread: 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!!!

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.

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.

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
	}

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.