public static void main(String[] args) {
	final Display display = new Display();
	Shell shell = new Shell(display);
	shell.setLayout(new FillLayout());
	shell.addListener(SWT.Paint, new Listener() {
		public void handleEvent(Event event) {
			event.gc.setLineStyle(SWT.LINE_DOT);
			event.gc.drawRectangle(30, 30, 300, 300);
		}
	});
	shell.setSize(640, 480);
	shell.open();
	while(!shell.isDisposed()) {
		if(!display.readAndDispatch()) display.sleep();
	}
	display.dispose();
}