64 lines
1.8 KiB
Java
64 lines
1.8 KiB
Java
// typeinfo/PetCount.java
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// ©2015 MindView LLC: see Copyright.txt
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// Using instanceof.
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import typeinfo.pets.*;
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import java.util.*;
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import static com.mindviewinc.util.Print.*;
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public class PetCount {
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static class PetCounter 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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PetCounter counter= new PetCounter();
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for(Pet pet : creator.createArray(20)) {
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// List each individual pet:
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printnb(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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print();
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print(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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