53 lines
1.6 KiB
Java
53 lines
1.6 KiB
Java
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//: typeinfo/PetCount3.java
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// <20>2015 MindView LLC: see Copyright.txt
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// Using isInstance()
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import typeinfo.pets.*;
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import java.util.*;
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import com.mindviewinc.util.*;
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import static com.mindviewinc.util.Print.*;
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public class PetCount3 {
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static class PetCounter
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extends LinkedHashMap<Class<? extends Pet>,Integer> {
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public PetCounter() {
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super(MapData.map(LiteralPetCreator.allTypes, 0));
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}
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public void count(Pet pet) {
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// Class.isInstance() eliminates instanceofs:
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for(Map.Entry<Class<? extends Pet>,Integer> pair
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: entrySet())
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if(pair.getKey().isInstance(pet))
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put(pair.getKey(), pair.getValue() + 1);
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}
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@Override
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public String toString() {
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StringBuilder result = new StringBuilder("{");
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for(Map.Entry<Class<? extends Pet>,Integer> pair
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: entrySet()) {
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result.append(pair.getKey().getSimpleName());
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result.append("=");
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result.append(pair.getValue());
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result.append(", ");
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}
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result.delete(result.length()-2, result.length());
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result.append("}");
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return result.toString();
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}
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}
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public static void main(String[] args) {
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PetCounter petCount = new PetCounter();
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for(Pet pet : Pets.createArray(20)) {
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printnb(pet.getClass().getSimpleName() + " ");
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petCount.count(pet);
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}
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print();
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print(petCount);
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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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{Pet=20, Dog=6, Cat=9, Rodent=5, Mutt=3, Pug=3,
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EgyptianMau=2, Manx=7, Cymric=5, Rat=2, Mouse=2, Hamster=1}
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*///:~
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