decorated : Java Glossary
When Swing talks about decorating a JDialog, it does not
mean putting pictures of bunnies all around the edges. It refers to whether
JDialog or JFrame has a title
bar for close, minimize and maximize button. You can turn it off with setUndecorated ( true ); You need to do
this in the constructor before it becomes displayable.
Controlling The Title Bar
It would be nice if you could independently hide
the various elements of a JFrame, the border, the title
bar, the close button, the minimize button, the maximize button, the resizing grab
points. It is not quite that easy. However, you do have the following tools.
Unfortunately, the setBorder command only works on