/* * Exercise9_5.java * * Created on September 17, 2002, 2:34 PM *//** * * @author  administrator */public class Exercise9_5 {  public static void main(String[] args) {    Circle9_5 obj1 = new Circle9_5();    Circle9_5 obj2 = new Circle9_5();        System.out.println(obj1);      System.out.println(obj2);      System.out.println(obj1.equals(obj2));      System.out.println(obj1.compareTo(obj2));    }}// Circle.java: The circle class that extends GeometricObjectclass Circle9_5 extends GeometricObject implements Comparable {  private double radius;  /** Default constructor */  public Circle9_5() {    this(1.0);  }  /** Construct circle with a specified radius */  public Circle9_5(double radius) {    this(radius, "white", false);  }  /** Construct a circle with specified radius, filled, and color */  public Circle9_5(double radius, String color, boolean filled) {    super(color, filled);    this.radius = radius;  }  /** Return radius */  public double getRadius() {    return radius;  }  /** Set a new radius */  public void setRadius(double radius) {    this.radius = radius;  }  /** Implement the findArea method defined in GeometricObject */  public double findArea() {    return radius * radius * Math.PI;  }  /** Implement the findPerimeter method defined in GeometricObject*/    public double findPerimeter() {    return 2 * radius * Math.PI;  }  /** Override the toString() method defined in the Object class */  public String toString() {    return "[Circle] radius = " + radius;  }    public int compareTo(Object obj) {    if (this.findArea() > ((Circle9_5)obj).findArea())      return 1;    else if (this.findArea() < ((Circle9_5)obj).findArea())      return -1;    else      return 0;  }    public boolean equals(Object obj) {    return this.radius == ((Circle9_5)obj).radius;  }}