Question

I am currently studying Java to improve myself. I have a program which has a main window, menu and submenus.

I have other windows on when I click on my submenus.

One of them is setRates which is

public SetMyRates(){
    JPanel dataPanel = new JPanel(new GridLayout(2, 2, 12, 6));
    dataPanel.add(setTLLabel);
    dataPanel.add(setDollarsLabel);
    dataPanel.add(setTLField);
    dataPanel.add(setDollarsField);
    JPanel buttonPanel = new JPanel();
    buttonPanel.add(closeButton);
    buttonPanel.add(setTLButton);
    buttonPanel.add(setDollarsButton);
    Container container = this.getContentPane();
    container.add(dataPanel, BorderLayout.CENTER);
    container.add(buttonPanel, BorderLayout.SOUTH);
    setTLButton.addActionListener(new SetTL());
    setDollarsButton.addActionListener(new SetDollars());
    closeButton.addActionListener(new closeFrame());
    dataPanel.setVisible(true);
    pack();
}

and I want that window to close when I click on my closeButton.

I made a class for closeButton, actionListener which is:

private class closeFrame implements ActionListener{
    public void actionPerformed(ActionEvent e){
       try{
          dispose();
       }
       catch(Exception ex){
          JOptionPane.showMessageDialog(null, "Please enter correct Rate.");
       }
    }
}

But when I click that button, it closes my main window instead of my submenus window. What should I exactly do to fix the problem?

Answer 1

You need to get a reference to the Window that you want to close and call dispose() directly on that reference. How you do this will depend on the details of your program — information that we’re currently not privy to.

Edit: one way to get that reference is via SwingUtilities.getWindowAncestor(...). Pass in the JButton reference returned from your ActionEvent object and call dispose on it. Something like…

public void actionPerformed(ActionEvent e) {
  Object o = e.getSource();
  if (o instanceof JComponent) { 
    JComponent component = (JComponent)o; 
    Window win = SwingUtilities.getWindowAncestor(component);
    win.dispose();
  }
}

• caveat: code neither compiled nor run nor tested in any way.
• Also note that for this to work, the component that holds and activates the ActionListener has to reside on the Window that you wish to close, else this won’t work.