Question

I have a JFrame which is maximized (frame.setExtendedState(JFrame.MAXIMIZED_BOTH)).

I want to find out the size it is now extended to, but frame.getSize() returns a size of (0, 0).

Answer 1

The frame won’t have the maximized size until you make it visible. So your basic code would be:

frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setVisible(true);
System.out.println(frame.getSize());