/* * Exercise9_6.java * * Created on September 17, 2002, 2:45 PM *//** * * @author  administrator */public class Exercise9_6 {  public static void main(String[] args) {    Rectangle9_6 obj1 = new Rectangle9_6();    Rectangle9_6 obj2 = new Rectangle9_6();        System.out.println(obj1);      System.out.println(obj2);      System.out.println(obj1.equals(obj2));      System.out.println(obj1.compareTo(obj2));    }}// Rectangle.java: The Rectangle class that extends GeometricObjectclass Rectangle9_6 extends GeometricObject implements Comparable {  private double width;  private double height;  /** Default constructor */  public Rectangle9_6() {    this(1.0, 1.0);  }  /** Construct a rectangle with width and height */  public Rectangle9_6(double width, double height) {    this(width, height, "white", false);  }  /** Construct a rectangle with specified width, height,      filled, and color */  public Rectangle9_6(double width, double height,    String color, boolean filled) {    super(color, filled);    this.width = width;    this.height = height;  }  /** Return width */  public double getWidth() {    return width;  }  /** Set a new width */  public void setWidth(double width) {    this.width = width;  }  /** Return height */  public double getHeight() {    return height;  }  /** Set a new height */  public void setHeight(double height) {    this.height = height;  }  /** Implement the findArea method in GeometricObject */  public double findArea() {    return width*height;  }  /** Implement the findPerimeter method in GeometricObject */  public double findPerimeter() {    return 2*(width + height);  }  /** Override the toString method defined in the Object class */  public String toString() {    return "[Rectangle] width = " + width +       " and height = " + height;  }    public int compareTo(Object obj) {    if (this.findArea() > ((Rectangle9_6)obj).findArea())      return 1;    else if (this.findArea() < ((Rectangle9_6)obj).findArea())      return -1;    else      return 0;  }    public boolean equals(Object obj) {    return this.findArea() == ((Rectangle9_6)obj).findArea();  }  }