Removing the Title Bar of a JFrame
The title bar and other decorations can be removed from a frame. A
frame without decorations looks and behaves like a JWindow
container (see Creating a Borderless Window). However, if the frame
never needs the decorations, it is better to use a JWindow
container.
Note: The decorations can only be removed while the frame is
not visible.
JFrame frame = new JFrame();
frame.setUndecorated(true);
// Get the current decorated state
boolean undecorated = frame.isUndecorated();
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