Pet类

Code1

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

Code2

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

Code3

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

Code4

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

Code5

//: typeinfo/pets/ForNameCreator.javapackage 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.javapackage typeinfo.pets;public class Hamster extends Rodent {  public Hamster(String name) { super(name); }  public Hamster() { super(); }} ///:~

Code7

//: typeinfo/pets/Individual.javapackage 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.javapackage typeinfo.pets;public class Manx extends Cat {  public Manx(String name) { super(name); }  public Manx() { super(); }} ///:~

Code10

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

Code11

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

Code12

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

Code13

//: typeinfo/pets/Pet.javapackage 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.javapackage typeinfo.pets;public class Pug extends Dog {  public Pug(String name) { super(name); }  public Pug() { super(); }} ///:~

Code17

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

Code18

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