Java program

I kindly need to Write a graphical application overriding the paint method of the JFrame class. Inside it, cast the Graphics object to a Graphics2D object and draw a dashed, rounded rectangle. The length of the dashes should be no longer than the length of the spaces between the dashes. The Hint they gave me is : Look up the Graphics2D, BasicStroke, and RoundRectangle2D.Double classes in the Java Class
Library.