Change size of window depending on size of the screen,Java

Question

I want to ask something because I have no idea.I have made a program on Java(Netbeans) and I want to check the size of windows.I want to change depending on the size of screen.Have you any idea?Thank you.

Answer 1

for example..

JFrame frame = new JFrame();
frame.setSize(Toolkit.getDefaultToolkit().getScreenSize());