คลาส Animal, Dog, และ Basenji

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รหัสที่ 9-16 คลาส Animal, Dog, และ Basenji

public class Animal {
  public void makeSound() { }
  public static void makeSound(Animal[] a) {
    for(int i=0; i<a.length; i++) {
      a[i].makeSound();
    }
  }
  //...
public class Dog extends Animal {
  public void bark() {
    makeSound();
  }
  public void makeSound() {
    System.out.println("โฮ่ง ๆ");
  }
  //...
public class Cat extends Animal {
  public void meow() {
    makeSound();
  }
  public void makeSound() {
    System.out.println("เหมียว ๆ");
  }
  //...
public class Basenji extends Dog {
  public void makeSound() {
    System.out.println("...");
  }
  public void hunt(Animal a) {...}
  //...

9. สร้างใหม่จากเก่า