How can avoid to close the window?

My problem is that when user decides to close a window, system should ask conferm to that action, if user responds no, the window should stay, vice versa window should be closed if user conferm closing.
Ok my code:
void this_internalFrameClosing(InternalFrameEvent e) {
int r;
this.setClosable(false);
JOptionPane dlg = new JOptionPane();
r = dlg.showConfirmDialog(this,"Are you sure to quit?","Quit?",dlg.YES_NO_OPTION);
if (r == dlg.YES_OPTION) {
this.setClosable(true);
doesn't work. How can I cancel closing of the window, because window will be closed anyway!

This will prevent your internal frame from closing:
frame.setDefaultCloseOperation(JInternalFrame.DO_NOTHING_ON_CLOSE);
Then you have to define your closing logic in the internalFrameClosing() method of InternalFrameListener. Be sure to close the window manually using frame.dispose().

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