66 lines
1.9 KiB
Java
66 lines
1.9 KiB
Java
// typeinfo/PetCount.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Using instanceof
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import typeinfo.pets.*;
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import java.util.*;
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public class PetCount {
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static class Counter extends HashMap<String,Integer> {
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public void count(String type) {
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Integer quantity = get(type);
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if(quantity == null)
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put(type, 1);
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else
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put(type, quantity + 1);
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}
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}
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public static void
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countPets(PetCreator creator) {
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Counter counter = new Counter();
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for(Pet pet : Pets.array(20)) {
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// List each individual pet:
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System.out.print(
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pet.getClass().getSimpleName() + " ");
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if(pet instanceof Pet)
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counter.count("Pet");
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if(pet instanceof Dog)
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counter.count("Dog");
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if(pet instanceof Mutt)
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counter.count("Mutt");
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if(pet instanceof Pug)
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counter.count("Pug");
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if(pet instanceof Cat)
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counter.count("Cat");
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if(pet instanceof EgyptianMau)
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counter.count("EgyptianMau");
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if(pet instanceof Manx)
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counter.count("Manx");
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if(pet instanceof Cymric)
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counter.count("Cymric");
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if(pet instanceof Rodent)
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counter.count("Rodent");
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if(pet instanceof Rat)
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counter.count("Rat");
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if(pet instanceof Mouse)
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counter.count("Mouse");
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if(pet instanceof Hamster)
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counter.count("Hamster");
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}
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// Show the counts:
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System.out.println();
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System.out.println(counter);
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}
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public static void main(String[] args) {
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countPets(new ForNameCreator());
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}
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}
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/* Output:
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Rat Manx Cymric Mutt Pug Cymric Pug Manx Cymric Rat
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EgyptianMau Hamster EgyptianMau Mutt Mutt Cymric Mouse Pug
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Mouse Cymric
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{EgyptianMau=2, Pug=3, Rat=2, Cymric=5, Mouse=2, Cat=9,
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Manx=7, Rodent=5, Mutt=3, Dog=6, Pet=20, Hamster=1}
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*/
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