參考看看, 雖然原文是印度文…..

org.jdesktop.application.FrameView – Narisa.com

@Override protected void startup() {
MainView main = new MainView(this);
JFrame frame = main.getFrame();
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
frame.setMinimumSize(new Dimension(800, 600));
show(main);
}