Java Swing GUI:

I am using ActionListener to preform the action when a button is clicked. What i want to do is when a button is clicked, open a new panel, but load/get the new panel from a different file.

This is what i have so far but i rather just link to another file. THANKS! =]

            public void actionPerformed(java.awt.event.ActionEvent e) {
                //LINK TO NEW FILE INSEAD OF...
                JFrame frame2 = new JFrame("Clicked");
                frame2.setVisible(true);
                frame2.setSize(200,200);
            }