How to reopen same Jdialog.

Question

Hi,
In my application,when user press the button, its going to open one JDialog where user is asked to Select Node on Jtree with the help of checkbox.
Same dialog consist of Ok and Cancel button.
Ok button must save the changes made by user and process the required task where as Cancel button must discard the changes.
At the end,both button should close the Jdialog.
What i want is , if user clicks same button again it should open previous JDialog which was got closed.
How can i do it.
please help.
code to pop-up jdialog in Main GUI class
private void repositoryMetadataButtonActionPerformed(java.awt.event.ActionEvent evt) {
RepositoryMetadataFrame.showDialog(AID_GUI.this,target_nameFormattedField);
public class RepositoryMetadataFrame extends javax.swing.JDialog {
public RepositoryMetadataFrame(Frame frame,Component locationComp) {
super(frame,"AID-Options", true);
RepositoryMetadataFrame.location = location;
initComponents();
public static void showDialog(Component frameComp,Component locationComp){
Frame frame = JOptionPane.getFrameForComponent(frameComp);
dialog = new RepositoryMetadataFrame(frame,locationComp);
dialog.setVisible(true);
return;
initComponent(){
  //to intialize all component and display it on system
private void okButtonActionPerformed(java.awt.event.ActionEvent evt){
     //Do Something
     setVisible(false);
private void cancelButtonActionPerformed(java.awt.event.ActionEvent evt) {
     //simply close
     setVisible(false);
}

Answer 1

In my application,when user press the button, its going to open one JDialog where user is asked to Select Node on Jtree with the help of checkbox.
Same dialog consist of Ok and Cancel button.Don't code a custom dialog if it's only that. Use one of the methods JOptionPane.showConfirmDialog(...).
Even if you want to display something more complex than a simple label (one of the forms accepts a custom Component).
These methods are likely to be more robust (threading bugs, memory leaks) than whatever custom dialog caching you may devise.
What i want is , if user clicks same button again it should open previous JDialog which was got closed.Do you mean, "open the same instance"? Why would you want that (I mean, there can be reasons, but it complexifies the code, so are you sure you need it)?
Or do you mean "open an identicial dialog"?
Then no problem: the first button's actionPerformed() will be invoked each time the button is clicked - the same code will execute each time.