JDialog boxes

Question

Hi,
Just a bit curious whats the best way to creat a JDialog box?
I currently have have one main panel, with one button. When the user clicks this button, it brind up the dialog box. I dont think i have done this correctly, as when the dialog box populates, when I move it around on the screen, it erases the contents off the panel that called the dialog (erases the contents when i move the dialog accross the screen.
Can any one help me set out the correct constructors for the DIalog and the panel calling it?
thanks in advance
public public class PanelA extends JPanel {
public class Dialoig Box extends JDialog {
public class GUI {
public () {
//code here to add a jbutton to panelA
//code here to add PanelA to the frame
//inner class here . Action listener for the button
class CheckButtonActionListener
implements ActionListener {
public void actionPerformed(ActionEvent event) {
//Main method here
Main frame = new Main();

Answer 1

import javax.swing.*;
public class Main extends javax.swing.JFrame {
    public Main() {
        initComponents();
    private void initComponents() {
        jPanel1 = new javax.swing.JPanel();
        jButton1 = new javax.swing.JButton();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Test Dialog Box");
        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        jPanel1.add(jButton1);
        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);
        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-401)/2, (screenSize.height-411)/2, 401, 411);
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        JDialog dialog = new DialogBox(this,true);
        dialog.setVisible(true);
    public static void main(String args[]) {
        new Main().setVisible(true);
    // Variables declaration - do not modify
    private javax.swing.JButton jButton1;
    private javax.swing.JPanel jPanel1;
    // End of variables declaration
    public class DialogBox extends javax.swing.JDialog {
        public DialogBox(java.awt.Frame parent, boolean modal) {
            super(parent, modal);
            initComponents();
        private void initComponents() {
            jPanel1 = new javax.swing.JPanel();
            jButton1 = new javax.swing.JButton();
            setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
            setTitle("Dialog Box");
            jButton1.setText("jButton1");
            jButton1.addActionListener(new java.awt.event.ActionListener() {
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    jButtonActionPerformed(evt);
            jPanel1.add(jButton1);
            getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);
            java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
            setBounds((screenSize.width-237)/2, (screenSize.height-191)/2, 237, 191);
        private void jButtonActionPerformed(java.awt.event.ActionEvent evt) {
            setVisible(false);
            dispose();
        private javax.swing.JButton jButton1;
        private javax.swing.JPanel jPanel1;
}