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  1. class Animal {
  2.     public String name;
  3.  
  4.     public Animal(String name) {
  5.         this.name = name;
  6.     }
  7.  
  8.     public void play() {}
  9. }
  10.  
  11. class Dog extends Animal {
  12.     public Dog(String name) {
  13.         super(name);
  14.     }
  15.  
  16.     public void play() {
  17.         System.out.println("わんわん！" + name + "だよ");
  18.     }
  19. }
  20.  
  21. class Cat extends Animal {
  22.     private int sleep;
  23.  
  24.     public Cat(String name, int sleep) {
  25.         super(name);
  26.         this.sleep = sleep;
  27.     }
  28.  
  29.     public void play() {
  30.         System.out.println("にゃあ！" + name + "だよ");
  31.         if(sleep == 1) {
  32.             System.out.println("...でも寝る");
  33.         }
  34.     }
  35. }
  36.  
  37. class Pet
  38. {
  39.     public static void main(String[] args) {
  40.         Animal[] pets = {
  41.             new Dog("ぽち"),
  42.             new Cat("たま", 1)
  43.         };
  44.  
  45.         for(Animal pet: pets) {
  46.             pet.play();
  47.         }
  48.     }
  49. }
  50.  
Success #stdin #stdout 0.15s 57588KB
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Standard input is empty
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わんわん！ぽちだよ
にゃあ！たまだよ
...でも寝る
https://ideone.com/5AnyAC
language:
Java (HotSpot 12)
created:
15 hours ago
visibility:
public

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