controlling objects in another class

manpreet Best Answer 3 years ago

I am learning Java, and am unsure what I am doing wrong. What I am trying to develop is a swing application with a number of different panels.

Depending on what is done in what has happened in one panel, I need to be able to change the status of components in other panels.

Have tried a number of things but as of yet have been unable to changes in the second panel.

Have enclosed a small app that hopefully shows what I am trying to achieve.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;

public class MainApp {

    public static void main(String[] args) {
        new MainApp();
    }

    public MainApp() {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                JFrame frame = new JFrame("Sample App");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });

    }

    public class TestPane extends JPanel {
        public TestPane() {
            setLayout(new GridLayout(0, 2));
            add(createLeftPane());
            add(new JPanel());
        }

        private JPanel createLeftPane() {
            JPanel panel = new JPanel(new BorderLayout());
            panel.setBorder(new EmptyBorder(10, 
                                                

                                                                                                        
                                                    
                                                
                                                

                                                    

                                                        
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