JWindow : Java Glossary

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JWindow
Like a JFrame, but without borders or menu bar. A generic term for both a JFrame and JDialog. JWindows can accept keystrokes.

You don’t use jWindow.add( child ); you use jWindow.getContentPane().add( child ). This is especially infuriating since the compiler cannot catch the error. Similarly instead of jWindow.setLayout( layoutManager ) you use jWindow.getContentPane().setLayout( layoutManager ).

Learning More

Oracle’s Javadoc on JWindow class : available:
JDialog
JFrame
pane
Swing
Window
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