The line I paste above is the line which fails. When I execute just the portion "SwingUtilities.getWindowAncestor(this);" using the debugger, I get the null pointer exception. "this" is not null and this code is called after the panel
11.1 NetBeans For using NetBeans GUI Builder, read my "Writing Java GUI ﴾AWT/Swing﴿ Application in NetBeans"; or Swing Tutorial's "Learning Swing with the NetBeans IDE". 11.2 Eclipse For using Eclipse GUI Builder, read "Wr
Java WindowListener Interface. The Java WindowListener is notified whenever you change the state of window. It is notified against WindowEvent. The WindowListener interface is found in java.awt.event package. It has three methods. Methods of WindowListene
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