Java/Poly.java at master · zar1111/Java · GitHub

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public class Poly {
    public static void main(String[] args) {
        int an = 2;
      if(an==1){
          show(new Cat());
      }
      else{
          show(new Dog());
      }

      //Animal a = new Cat();
      //a.eat();
      //Cat c = (Cat)a;
      //c.work();
  }

    public static void show(Animal a)  {
        a.eat();


    }
}

abstract class Animal {
    abstract void eat();
}

class Cat extends Animal {
    public void eat() {
        System.out.println("1");
    }
    public void work() {
        System.out.println("2");
    }
}

class Dog extends Animal {
    public void eat() {
        System.out.println("3");
    }
    public void work() {
        System.out.println("4");
    }
}