Core Java project about JFrame

Question

I am making a small Java project in which there are 3 frames connected together, say f1, f2, f3 & f4. f1 is having a button and after clicking it it calls f2 and f2 also has button which calls f3. The problem is if I opened all the form one by one then when I close form f2 or f3 then the main form(f1) gets closed.

I want that even I close form f2 and f3 my main form should not be close until I close it personally.

package mnm;

public class NewJFrame extends javax.swing.JFrame {


    public NewJFrame() {
        initComponents();
    }

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

        NewJFrame1 nb=new NewJFrame1();
        nb.setVisible(true);
    }


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

            public void run() {
                new NewJFrame().setVisible(true);
                NewJFrame gn=new NewJFrame();
                gn.setDefaultCloseOperation(NewJFrame.DISPOSE_ON_CLOSE);
            }
        });
    }

    private javax.swing.JButton jButton1;

}

Answer 1

..3 frames connected together

Don't do it! See The Use of Multiple JFrames, Good/Bad Practice? for details. Two of those frames should be either modal dialogs or a JOptionPane.

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I want that even I close form f2 and f3 my main form should not be close until I close it personally.

Now that I've warned you against it, I'll add..

The behavior requested can be achieved by setting a default close operation of DISPOSE_ON_CLOSE as seen in this answer. Any of those frames can be closed without affecting the others.