How to get the JFrame's "client rectangle"

When I run the code:
JFrame f = new JFrame();
f.setSize(640, 480);the frame has this size, but it includes the borders and the title bar.
How can I learn the thickness of the borders and the title bar - that is something calles "the client rectangle" in WinApi.

getContentPane().getSize();

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How to get the JFrame's "client rectangle"

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