java 编程思想-根据类型信息向容器随机创建对象.doc

import java.util.*;/(用来随机创建的)抽象基类/PetCreator.java abstract class PetCreator private Random rand=new Random(47); public abstract ListClasstypes(); public Pet randomPet() int n=rand.nextInt(types().size(); /随机范围=types容器的大小 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) Petresult=new Petsize; for(int i=0;isize;i+) resulti=randomPet();/ 将随机生成的对象转型到Pet数组引用 return result; public ArrayListarrayList(int size) ArrayListresult=new ArrayList(); Collections.addAll(result, createArray(size); System.out.println(已填加+result.size()+个种类); /根据Pet数组引用 装入容器 return result; /PetCreator 的派生类/ForNameCreator.javaclass ForNameCreator extends PetCreator private static ListClasstypes= new ArrayListClass(); private static StringtypesNames= typeinfo.pets.Mutt, typeinfo.pets.Pug, typeinfo.pets.EgyptianMau, typeinfo.pets.Manx, typeinfo.pets.Cymric, typeinfo.pets.Rat, typeinfo.pets.Mouse, typeinfo.pets.Hamster, ; private static void Loader() try for(String name:typesNames) types.add(Class)Class.forName(name); catch(ClassNotFoundException e) System.out.println(创建对象的Class类时出现错误); throw new RuntimeException(e); static System.out.println(开始向types容器输入各类Class类型信息); Loader();public ListClasstypes()return types;/返回对容器(类型信息类)的引用 typespublic static void main(String arges)new ForNameCreator();/随机创建.javaclass 随机创建 public static void countPets(PetCreator creator) /向上转型为抽象基类的引用 creator.arrayList(20);/调用基类中arrayList函数 /开始真的随机创建20个宠物对象 并放入容器中 public static void main(String arges) /一切从这里开始 countPets(new ForNameCreator(); /创建派生类对象 调用本类静态函数 /*以下的模块框架是上面的材料*/5层类继承的基类 第一层/Individual.javaclass Individual public Individual(String name) =name; protected Individual() String name;/第 2层/Person.javaclass Person extends Individual public Person(String name)super(name); public Person()super();/第 2层 最后大部分都是围绕这个类/Pet.javaclass Pet extends Individual public Pet(String name)super(name); public Pet()super();/第 3层/Rodent.javaclass Rodent extends Pet public Rodent(String name)super(name); public Rodent()super();/第 4层/Hamster.javaclass Hamster extends Rodent public Hamster(String name)super(name); public Hamster()super();/第 4层/Mouse.javaclass Mouse extends Rodent public Mouse(String name)super(name); public Mouse()super();/第 4层/Rat.javaclass Rat extends Rodent public Rat(String name)super(name); public Rat()super();/第 3层/Dog.javaclass Dog extends Pet public Dog(String name)super(name); public Dog()super();/第 4层/Pug.javaclass Pug extends Dog public Pug(String name)super(name); public Pug()super();/第 4层/Mutt.javaclass Mutt extends Dog public Mutt(String name)super(name); public Mutt()super();/第 3层/Cat.javaclass Cat extends Pet public Cat(String name)super(name); public Cat()super();/第 4层/EgyptianMau .javaclass EgyptianMau extends Cat public EgyptianMau(String name)super(name); public EgyptianMau()super();/第 4层/Manx.javaclass Manx extends Cat public Manx(String name)super(name); public Manx()super();/第 5层/C