//: c11:CatsAndDogs.java
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 200
// Available at http://www.BruceEckel.com
// Simple collection with Iterator
import java.util.*;

class Pet {
  void print() {
    System.out.println("Pet Defualt Print");
  }
 }
class Cat extends Pet{
  private int catNumber;
  Cat (int i) {
    catNumber = i;
  }
  void print() {
    System.out.println("Cat number " + catNumber);
  }
}

class Dog extends Pet{
  private int dogNumber;
  Dog (int i) {
    dogNumber = i;
  }
  void print() {
    System.out.println("Dog number " + dogNumber);
  }
}

public class CatsAndDogs {

  public static void main (String[] args) {
    ArrayList cats = new ArrayList();
    
   for (int i = 0; i < 7; i++) {
      cats.add (new Cat (i));
      cats.add(new Dog (i));
   }

    Iterator e = cats.iterator();
    while (e.hasNext())
         ((Pet)e.next()).print(); 
    // Cat and Dog are detected only at run-time
  }
}