Javaでひさびさのポリモフィズム動物園(多態性動物園)
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import java.util.*; public class Main { public static void main(String[] args){ List<Animal> zoo = new ArrayList<Animal>(); Animal a; a = new Cat(3); zoo.add(a); a = new Dog(5); zoo.add(a); a = new Mike(7); zoo.add(a); Breeder b = new Breeder(); b.breed(zoo); } } class Breeder { public void breed(List<Animal> animals){ for(Animal a : animals){ a.cry(); } } } abstract class Animal{ public int age; public Animal(int age){ this.age = age; } public abstract void cry(); } class Cat extends Animal{ public Cat(int age){ super(age); } @Override public void cry(){ System.out.println("ニャー(" + this.age +")"); } } class Dog extends Animal{ public Dog(int age){ super(age); } @Override public void cry(){ System.out.println("ワン(" + this.age +")"); } } class Mike extends Cat{ public Mike(int age){ super(age); } } |
