14.1

 1 import java.awt.*;
 2 import java.util.Scanner;
 3 
 4 import javax.swing.*;
 5 
 6 public class Test extends JFrame {
 7   public static void main(String[] args) {
 8       Comparable a1 = new GeometricObject("white",10);
 9       Comparable a2 = new GeometricObject("yellow",20);
10       Comparable a3 = GeometricObject.max(a1, a2);
11       
12       
13       System.out.println("the bigger on is:");
14       System.out.print(((GeometricObject)a3).getColor());
15   }  
16 }

 1 // GeometricObject.java: The abstract GeometricObject class
 2 public class GeometricObject implements Comparable{
 3   private String color = "white";
 4   private boolean filled;
 5   private int a;
 6 
 7   /**Default construct*/
 8   protected GeometricObject() {
 9   }
10 
11   /**Construct a geometric object*/
12   protected GeometricObject(String color, int a) {
13     this.color = color;
14     this.a = a;
15   }
16 
17   public static Comparable max(Comparable c1,Comparable c2){
18       if(c1.compareTo(c2)>0)
19       return c1;
20       else return c2;
21   }
22   public int compareTo(Object o){
23       if(this.getArea() > ((GeometricObject)o).getArea())
24           return 1;
25       else if (this.getArea() == ((GeometricObject)o).getArea())
26           return 0;
27       else return -1;
28   }
29   /**Getter method for color*/
30   public String getColor() {
31     return color;
32   }
33 
34   /**Setter method for color*/
35   public void setColor(String color) {
36     this.color = color;
37   }
38 
39   /**Getter method for filled. Since filled is boolean,
40      so, the get method name is isFilled*/
41   public boolean isFilled() {
42     return filled;
43   }
44 
45   /**Setter method for filled*/
46   public void setFilled(boolean filled) {
47     this.filled = filled;
48   }
49 
50   /**Abstract method findArea*/
51   public  int getArea(){
52       return a*a;
53   }
54 
55   /**Abstract method getPerimeter*/
56   public  double getPerimeter(){
57       return 1;
58   }
59 }