Closing JFrame => Program crashes

Question

I have two JFrames:

• ApplicationsJFrame, which is my Main, and
• InsertApplicationsForm.

I'm setting the InsertApplicationsForm visible by clicking a Button in my ApplicationsJFrame.

Every time I'm closing the InsertApplicationsForm the ApplicationsJFrame also closes, but the Program is still running, same when I minimize InsertApplicationsForm, ApplicationsJFrame minimizes, but wont maximize anymore...

ApplicationsJFrame:

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("T-AMS");
setFocusableWindowState(false);

InsertApplicationsForm:

public class InsertApplicationForm extends javax.swing.JFrame {

    /**
     * Creates new form InsertApplicationForm
     */
    public InsertApplicationForm() {
        initComponents();
    }

[...]

setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        setTitle("Insert Application")
addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosed(java.awt.event.WindowEvent evt) {
                formWindowClosed(evt);
            }
        });

private void formWindowClosed(java.awt.event.WindowEvent evt) {                                  
        ApplicationsJFrame.insert = false;
    }

Open InsertApplicationsForm:

new InsertApplicationForm().setVisible(true);

Answer 1

You should just add the EXIT_ON_CLOSE constant int to your main JFrame. Instead, add a WindowListener to your temporal Frames:

//Suppose you have a custom Frame in your Form class
class InsertApplicationsForm extends JFrame{
//Some stuff
//...

public InsertApplicationsForm(){
//Implement
    //DO NOT ADD setDefaultCloseOperation
setVisible(true);
}

addWindowListener(new WindowAdapter(){

     @Override
    public void windowClosing(WindowEvent e){
        InsertApplicationsForm.this.dispose();
    }

});

}

So in your main class, or method, event, whatever just call this:

new InsertApplicationsForm();

And will automatically open a new JFrame, which you can close and not affecting the main or other Frames. You can even instance multiple of this class Frames and closing won't affect other ones.