[20-05-05][Thinking in Java 11]Java Interfaces 1 - Abstract

 1 package test_2_3;
 2 
 3 public abstract class Rodent {
 4 
 5     public abstract void eat();
 6     
 7     public abstract void run();
 8     
 9     public String what() {
10         
11         return "Rodent";
12     }
13 }

 1 package test_2_3;
 2 
 3 public class Gerbil extends Rodent{
 4 
 5     @Override
 6     public void eat() {
 7         
 8         System.out.println("Gerbil.eat()");
 9     }
10 
11     @Override
12     public void run() {
13 
14         System.out.println("Gerbil.run()");
15     }
16     
17 }

 1 package test_2_3;
 2 
 3 public class Hamster extends Rodent{
 4 
 5     @Override
 6     public void eat() {
 7         
 8         System.out.println("Hamster.eat()");
 9     }
10     
11     @Override
12     public void run() {
13         
14         System.out.println("Hamster.run()");
15     }
16     
17     @Override
18     public String what() {
19         
20         return "Hamster";
21     }
22 }

 1 package test_2_3;
 2 
 3 public class Mouse extends Rodent{
 4 
 5     @Override
 6     public void eat() {
 7         
 8         System.out.println("Mouse.eat()");
 9     }
10     
11     @Override
12     public void run() {
13         
14         System.out.println("Mouse.run()");
15     }
16     
17     @Override
18     public String what() {
19 
20         return "Mouse";
21     }
22 }

 1 package test_2_3;
 2 
 3 public class Test {
 4     
 5     public static void main(String[] args) {
 6 
 7         Rodent[] rodents = {new Gerbil(), new Hamster(), new Mouse()};
 8         
 9         for (Rodent rodent : rodents) {
10             rodent.eat();
11         }
12         
13         for (Rodent rodent : rodents) {
14             rodent.run();
15         }
16         
17     }
18 
19 }