Java modal window with maximize button

Question

How could I create a window which is modal and has a maximize button?
So is it possible to create a modal JFrame or create a JDialog with maxim

Answer 1

On most look and feels, modal windows (such as JDialog) do not have a maximise button simply because they're not supposed to be maximised (or minimised) at all.

It's possible with some tricks to add a maximise button, but it would be completly against the way JDialog is supposed to work. If you need a maximise button, the best solution would be using a JWindow or a JFrame instead of a JDialog. Those windows support maximisation and minimisation.

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WARNING: You shouldn't do that, no matter what.

A trick to do this in JDialog:

setUndecorated(true);
getRootPane().setWindowDecorationStyle(JRootPane.FRAME);