Pet类

Code1

//: typeinfo/pets/Cat.java
package typeinfo.pets;

public class Cat extends Pet {
  public Cat(String name) { super(name); }
  public Cat() { super(); }
} ///:~

Code2

//: typeinfo/pets/Cymric.java
package typeinfo.pets;

public class Cymric extends Manx {
  public Cymric(String name) { super(name); }
  public Cymric() { super(); }
} ///:~

Code3

//: typeinfo/pets/Dog.java
package typeinfo.pets;

public class Dog extends Pet {
  public Dog(String name) { super(name); }
  public Dog() { super(); }
} ///:~

Code4

//: typeinfo/pets/EgyptianMau.java
package typeinfo.pets;

public class EgyptianMau extends Cat {
  public EgyptianMau(String name) { super(name); }
  public EgyptianMau() { super(); }
} ///:~

Code5

//: typeinfo/pets/ForNameCreator.java
package typeinfo.pets;
import java.util.*;

public class ForNameCreator extends PetCreator {
  private static List<Class<? extends Pet>> types = new ArrayList<Class<? extends Pet>>(); // Types that you want to be randomly created: private static String[] typeNames = { "typeinfo.pets.Mutt", "typeinfo.pets.Pug", "typeinfo.pets.EgyptianMau", "typeinfo.pets.Manx", "typeinfo.pets.Cymric", "typeinfo.pets.Rat", "typeinfo.pets.Mouse", "typeinfo.pets.Hamster" }; @SuppressWarnings("unchecked") private static void loader() { try { for(String name : typeNames) types.add( (Class<? extends Pet>)Class.forName(name)); } catch(ClassNotFoundException e) { throw new RuntimeException(e); } } static { loader(); } public List<Class<? extends Pet>> types() {return types;} } ///:~

Code6

//: typeinfo/pets/Hamster.java
package typeinfo.pets;

public class Hamster extends Rodent {
  public Hamster(String name) { super(name); }
  public Hamster() { super(); }
} ///:~

Code7

//: typeinfo/pets/Individual.java
package typeinfo.pets;

public class Individual implements Comparable<Individual> {
  private static long counter = 0;
  private final long id = counter++;
  private String name;
  public Individual(String name) { this.name = name; }
  // 'name' is optional:
  public Individual() {}
  public String toString() {
    return getClass().getSimpleName() +
      (name == null ? "" : " " + name);
  }
  public long id() { return id; }
  public boolean equals(Object o) {
    return o instanceof Individual &&
      id == ((Individual)o).id;
  }
  public int hashCode() {
    int result = 17;
    if(name != null)
      result = 37 * result + name.hashCode();
    result = 37 * result + (int)id;
    return result;
  }
  public int compareTo(Individual arg) {
    // Compare by class name first:
    String first = getClass().getSimpleName();
    String argFirst = arg.getClass().getSimpleName();
    int firstCompare = first.compareTo(argFirst);
    if(firstCompare != 0)
    return firstCompare;
    if(name != null && arg.name != null) {
      int secondCompare = name.compareTo(arg.name);
      if(secondCompare != 0)
        return secondCompare;
    }
    return (arg.id < id ? -1 : (arg.id == id ? 0 : 1));
  }
} ///:~

Code8

//: typeinfo/pets/LiteralPetCreator.java // Using class literals. package typeinfo.pets; import java.util.*; public class LiteralPetCreator extends PetCreator { // No try block needed. @SuppressWarnings("unchecked") public static final List<Class<? extends Pet>> allTypes = Collections.unmodifiableList(Arrays.asList( Pet.class, Dog.class, Cat.class, Rodent.class, Mutt.class, Pug.class, EgyptianMau.class, Manx.class, Cymric.class, Rat.class, Mouse.class,Hamster.class)); // Types for random creation: private static final List<Class<? extends Pet>> types = allTypes.subList(allTypes.indexOf(Mutt.class), allTypes.size()); public List<Class<? extends Pet>> types() { return types; } public static void main(String[] args) { System.out.println(types); } } /* Output: [class typeinfo.pets.Mutt, class typeinfo.pets.Pug, class typeinfo.pets.EgyptianMau, class typeinfo.pets.Manx, class typeinfo.pets.Cymric, class typeinfo.pets.Rat, class typeinfo.pets.Mouse, class typeinfo.pets.Hamster] *///:~

Code9

//: typeinfo/pets/Manx.java
package typeinfo.pets;

public class Manx extends Cat {
  public Manx(String name) { super(name); }
  public Manx() { super(); }
} ///:~

Code10

//: typeinfo/pets/Mouse.java
package typeinfo.pets;

public class Mouse extends Rodent {
  public Mouse(String name) { super(name); }
  public Mouse() { super(); }
} ///:~

Code11

//: typeinfo/pets/Mutt.java
package typeinfo.pets;

public class Mutt extends Dog {
  public Mutt(String name) { super(name); }
  public Mutt() { super(); }
} ///:~

Code12

//: typeinfo/pets/Person.java
package typeinfo.pets;

public class Person extends Individual {
  public Person(String name) { super(name); }
} ///:~

Code13

//: typeinfo/pets/Pet.java
package typeinfo.pets;

public class Pet extends Individual {
  public Pet(String name) { super(name); }
  public Pet() { super(); }
} ///:~

Code14

//: typeinfo/pets/PetCreator.java
// Creates random sequences of Pets.
package typeinfo.pets;
import java.util.*;

public abstract class PetCreator {
  private Random rand = new Random(47);
  // The List of the different types of Pet to create:
  public abstract List<Class<? extends Pet>> types();
  public Pet randomPet() { // Create one random Pet
    int n = rand.nextInt(types().size());
    try {
      return types().get(n).newInstance();
    } catch(InstantiationException e) {
      throw new RuntimeException(e);
    } catch(IllegalAccessException e) {
      throw new RuntimeException(e);
    }
  } 
  public Pet[] createArray(int size) {
    Pet[] result = new Pet[size];
    for(int i = 0; i < size; i++)
      result[i] = randomPet();
    return result;
  }
  public ArrayList<Pet> arrayList(int size) {
    ArrayList<Pet> result = new ArrayList<Pet>();
    Collections.addAll(result, createArray(size));
    return result;
  }
} ///:~

Code15

//: typeinfo/pets/Pets.java
// Facade to produce a default PetCreator.
package typeinfo.pets;
import java.util.*;

public class Pets {
  public static final PetCreator creator =
    new LiteralPetCreator();
  public static Pet randomPet() {
    return creator.randomPet();
  }
  public static Pet[] createArray(int size) {
    return creator.createArray(size);
  }
  public static ArrayList<Pet> arrayList(int size) {
    return creator.arrayList(size);
  }
} ///:~

Code16

//: typeinfo/pets/Pug.java
package typeinfo.pets;

public class Pug extends Dog {
  public Pug(String name) { super(name); }
  public Pug() { super(); }
} ///:~

Code17

//: typeinfo/pets/Rat.java
package typeinfo.pets;

public class Rat extends Rodent {
  public Rat(String name) { super(name); }
  public Rat() { super(); }
} ///:~

Code18

//: typeinfo/pets/Rodent.java
package typeinfo.pets;

public class Rodent extends Pet {
  public Rodent(String name) { super(name); }
  public Rodent() { super(); }
} ///:~