Adding maxmize icon to JFrame

When i create a frame and display it it shown with only minimize and close icons, can any one help me to add the maximize/restore icon to frame.

thanks in advance

Actually in this case when we use the method jf.setResizable(true);
the maximize/restore icon is disabled.

note 'jf' is a JFrame object.

standard behaviour if
jf.setResizable(true);
is really
jf.setResizable(false);

what java version?
what look and feel?

can you post a sample program that demonstrates this?
just a frame with a size of 100x100 (and any L&F code) will do