How to minimize an undecorated JFrame?

Question

I want to minimize a JFrame ?

Note: JFrame is set undecorated to true in Netbeans.

Answer 1

How to set minimize action for JFrame when clicked a JButton?

Not sure why you want to do this. The frame already has to button to click. Why do you need another button?

Anyway to change the state of the frame:

frame.setExtendedState( JFrame.ICONIFIED );