1. public class Dog {
2.     private float height;
3.     private float weight;
4.    
5.     public Dog(float height, float weight) {
6.         this.height = height;
7.         this.weight = weight;
8.     }
9.    
10.     public void walk() {
11.         //walking
12.     }
13.  
14. }
15.  
16. public class BullDog extends Dog {
17.     public void walk() {
18.         //bulldog walking
19.     }
20. }
21.  
22. public class ChihuahuaDog extends Dog {
23.     public void walk() {
24.         //chihuahua walking
25.     }
26. }