//: c11:petcount2:PetCount2.java
// From Thinking in Java, 2nd Edition
// Available at http://www.BruceEckel.com
// (c) Bruce Eckel 1999
// Copyright notice in Copyright.txt
// Using Java 1.1 class literals
package c11.petcount2;
import java.util.*;

class Pet {}
class Dog extends Pet {}
class Pug extends Dog {}
class Cat extends Pet {}
class Rodent extends Pet {}
class Gerbil extends Rodent {}
class Hamster extends Rodent {}

class Counter { int i; }

public class PetCount2 {
  public static void main(String[] args) {
    ArrayList pets = new ArrayList();
    Class[] petTypes = {
      // Class literals work in Java 1.1+ only:
      Pet.class,
      Dog.class,
      Pug.class,
      Cat.class,
      Rodent.class,
      Gerbil.class,
      Hamster.class,
    };
    try {
      for(int i = 0; i < 15; i++) {
        // Offset by one to eliminate Pet.class:
        int rnd = 1 + (int)(
          Math.random() * (petTypes.length - 1));
        pets.add(
          petTypes[rnd].newInstance());
      }
    } catch(InstantiationException e) {}
      catch(IllegalAccessException e) {}
    HashMap h = new HashMap();
    for(int i = 0; i < petTypes.length; i++)
      h.put(petTypes[i].toString(),
        new Counter());
    for(int i = 0; i < pets.size(); i++) {
      Object o = pets.get(i);
      if(o instanceof Pet)
        ((Counter)h.get(
          "class c11.petcount2.Pet")).i++;
      if(o instanceof Dog)
        ((Counter)h.get(
          "class c11.petcount2.Dog")).i++;
      if(o instanceof Pug)
        ((Counter)h.get(
          "class c11.petcount2.Pug")).i++;
      if(o instanceof Cat)
        ((Counter)h.get(
          "class c11.petcount2.Cat")).i++;
      if(o instanceof Rodent)
        ((Counter)h.get(
          "class c11.petcount2.Rodent")).i++;
      if(o instanceof Gerbil)
        ((Counter)h.get(
          "class c11.petcount2.Gerbil")).i++;
      if(o instanceof Hamster)
        ((Counter)h.get(
          "class c11.petcount2.Hamster")).i++;
    }
    for(int i = 0; i < pets.size(); i++)
      System.out.println(
        pets.get(i).getClass().toString());
    Iterator keys = h.keySet().iterator();
    while(keys.hasNext()) {
      String nm = (String)keys.next();
      Counter cnt = (Counter)h.get(nm);
      System.out.println(
        nm.substring(nm.lastIndexOf('.') + 1) + 
        " quantity: " + cnt.i);
    }
  }
} ///:~