Posted on 2004-10-25
Last Modified: 2010-03-31
Hi Experts World!!

Please take a look at these two classes and tell me why a call the combox is not poping up

=============== FIRST CLASS =================================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

 * @author  Agbeko Komla
public class DiceGame {
    //private static DicePanel d = new DicePanel();
    //private static ChooseTypeOfDie  c = new ChooseTypeOfDie();
    //private static GetNumberOfSides g = new GetNumberOfSides();
    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
            String dieType =  (new ChooseTypeOfDie()).getDieType();
            //int  numOfSide = (new GetNumberOfSides()).getNumOfSides();
         //   if(dieType.equals("aRegularDie"))
          //  (new DicePanel(dieType, numOfSide)).createAndShowGUI();
============================= SECOND CLASS ==========================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;

 * @author  Agbeko Komla
public class ChooseTypeOfDie extends JPanel {
    private static final String dieTypes[] = { "aRegularDie", "aLoadedDie"};
    private static String selectedType;
    /** Creates a new instance of ChooseTypeOfDie */
    public ChooseTypeOfDie() {  
        JComboBox dies = new JComboBox(dieTypes);
        selectedType =  (String)dies.getSelectedItem();  
    public String getDieType(){
        return selectedType;

Question by:komlaaa
    LVL 16

    Assisted Solution

    The combobox should be added to a window, then show the window.

    Accepted Solution

    You need to put the JPanel within some window to display it.  In this case you probably want to use a JDialog, and, in fact, you should probably change ChooseTypeOf Die to extend JDialog.  Then just don't forget to call show() on it.


    Author Comment

    sample code please
    LVL 16

    Expert Comment

    /* */

    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;

    class Chooser extends JDialog implements ActionListener
         JComboBox combo;
         final String faces[] = { ":-)", ":-(", "<|:-)"};
         String selectedValue;

            // set this dialog with owner, title, modal
            super(new Frame(), "Please choose a face", true);

            // set dialog's size

            // set dialog's location to the center of screen

            // get a reference to dialog's content
            Container c = getContentPane();

            // set layout manager of dialog's content
            c.setLayout( new BorderLayout() );

            // new instance of combo with init choices
            combo = new JComboBox( faces );

            // add a listener to the combo to get selected value when changed.

            JPanel panel = new JPanel( new FlowLayout( FlowLayout.CENTER ) );

            // add the combo to a panel for layout purpose

            // add the panel to the dialog's content
            c.add( panel );
            c.add( new JLabel("(Close me to get the selected face)",JLabel.CENTER), BorderLayout.SOUTH);

         // invoked when the combo is selected
         public void actionPerformed(ActionEvent e)
             // save the selected item
             selectedValue = (String)combo.getSelectedItem();

         public String getSelectedChoice()
             // show this dialog, and wait until user hits close button

             // after this dialog is closed, return the selected value.
             return selectedValue;

    public class ComboShowDemo

        public static void main(String[] args)
            String selectedChoice = new Chooser().getSelectedChoice();
            System.out.println("Selected face: "+selectedChoice);


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