Change the JCombobox another topics class

Hello world

I have created two different classes which extends the JFrame class, on one of the classes, I was setting a component JCombobox and on the other, I was setting a component JButton.
Now I want that when the JButton clicked on the second class JCombobox items will be changed in the first class.
Basically, I have been create a method in the first class where JCombobox component to this change the items in the JCombobox, can I call this method of the second class (without static, because I need the JCombobox as static also)?

Any other solution will be appreciated.

See you soon,.
Moshik.

Moshik wrote:
its creating another instance of MainWindow.

Yes, just do what you tell it to do.

and when I do this:
MainWindow.this.changeComboBoxDisplayItem();
its returns me an error.

Yes, since you are not in the MainWindow class, this is impossible. Also, you declare your PopUpWindow parameter as a variable of JFrame not a variable MainWindow, so MainWindow methods are not allowed.

You are on the right track, but you just need to be able to get a handle on the MainWindow object that is passed to the constructor and use it. Here's my modification of your code. There are also a few other changes including:

(1) use ActionListeners to respond to button events, not MouseListeners.
2) avoid JFrame and JDialog subclassing since it is rarely needed (in fact, the same argument can be made for not not subclassing JPanel as I do here)
(3) avoid the provision null. Use layout managers to help you organize the GUI components.
(4) I use a DefaultComboBoxModel in case I want to later be able to easily add or remove items in the drop-down list box.

import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.*;

import javax.swing.*;

public class MainPanel extends JPanel {
   private static final String[] ITEMS = {"item 1", "item 2", "item 3"};
   private DefaultComboBoxModel comboModel = new DefaultComboBoxModel(ITEMS);
   private JComboBox comboBox = new JComboBox(comboModel);
   private JButton button;
   private PopUpPanel popUpPanel;
   private JDialog dialog;

   public MainPanel() {
      setPreferredSize(new Dimension(600, 400));

      button = new JButton("PopUp Window");
      button.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent evt) {
            if (popUpPanel == null || dialog == null) {
               JFrame frame = (JFrame) SwingUtilities.getWindowAncestor(MainPanel.this);
               popUpPanel = new PopUpPanel(MainPanel.this);

               dialog = new JDialog(frame, "PopUp Dialog", false);
               dialog.getContentPane().add(popUpPanel);
               dialog.pack();
               dialog.setLocationRelativeTo(null);
            }
            dialog.setVisible(true);
         }
      });

      JPanel innerPanel = new JPanel(new GridLayout(0, 1, 0, 30));
      innerPanel.add(button);
      innerPanel.add(comboBox);

      int eb = 20;
      setBorder(BorderFactory.createEmptyBorder(eb, eb, eb, eb));
      add(innerPanel);
   }

   public void changeComboBoxDisplayItem() {
      comboBox.setSelectedItem("item 3");
   }

   private static void createAndShowUI() {
      MainPanel panel = new MainPanel();

      JFrame frame = new JFrame("Main Window");
      frame.getContentPane().add(panel);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.pack();
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      java.awt.EventQueue.invokeLater(new Runnable() {
         public void run() {
            createAndShowUI();
         }
      });
   }
}

class PopUpPanel extends JPanel {
   private JButton button;
   private MainPanel mainPanel;

   public PopUpPanel(MainPanel mainPanel) {
      setPreferredSize(new Dimension(200, 100));
      this.mainPanel = mainPanel;

      button = new JButton("ComboBox Change");
      button.addActionListener(new ActionListener() {

         public void actionPerformed(ActionEvent e) {
            PopUpPanel.this.mainPanel.changeComboBoxDisplayItem();
         }
      });
      add(button);
   }
}

Tags: Java

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See also:
- http://KB.mozillazine.org/Preferences_not_saved

Change the JCombobox another topics class

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