/* * Copyright (c) 2000 David Flanagan.  All rights reserved. * This code is from the book Java Examples in a Nutshell, 2nd Edition. * It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied. * You may study, use, and modify it for any non-commercial purpose. * You may distribute it non-commercially as long as you retain this notice. * For a commercial use license, or to purchase the book (recommended), * visit http://www.davidflanagan.com/javaexamples2. */package com.davidflanagan.examples.classes;/** * This is a subclass of Rect that allows itself to be drawn on a screen. * It inherits all the fields and methods of Rect * It relies on the java.awt.Graphics object to perform the drawing. **/public class DrawableRect extends Rect {    /** The DrawableRect constructor just invokes the Rect() constructor */    public DrawableRect(int x1, int y1, int x2, int y2) { super(x1,y1,x2,y2); }        /** This is the new method defined by DrawableRect */    public void draw(java.awt.Graphics g) {        g.drawRect(x1, y1, (x2 - x1), (y2-y1));    }}