原型模式

     用原型实例指定创建对象的种类,并且通过拷贝这些原型创建新的对象.

     Prototype模式允许一个对象再创建另外一个可定制的对象，根本无需知道任何如何创建的细节。

     工作原理是:通过将一个原型对象传给那个要发动创建的对象，这个要发动创建的对象通过请求原型对象拷贝它们自己来实施创建。

 

1. public class User {
    private String name;
    private int    age;
    public String getName() {
     return name;
    }
    public void setName(String name) {
     this.name = name;
    }
    public int getAge() {
     return age;
    }
    public void setAge(int age) {
     this.age = age;
    }
    @Override
    public boolean equals(Object obj) {
     // TODO Auto-generated method stub
     return super.equals(obj);
    }
   }
2. public class Stu {
    private String name;
    private int scores;
    public String getName() {
     return name;
    }
    public void setName(String name) {
     this.name = name;
    }
    public int getScores() {
     return scores;
    }
    public void setScores(int scores) {
     this.scores = scores;
    }
    @Override
    public String toString() {
     return "Stu [name=" + name + ", scores=" + scores + "]";
    }
   }

3. package prototype;

   public class Prototype implements Cloneable {
    
    private Stu stu;
    private User user;
    public User getUser() {
     return user;
    }

    public void setUser(User user) {
     this.user = user;
    }
    

    public Stu getStu() {
     return stu;
    }

    public void setStu(Stu stu) {
     this.stu = stu;
    }

    @Override
    protected Object clone()  {
     // TODO Auto-generated method stub
     try {
      return super.clone();
     } catch (CloneNotSupportedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
      return null;
     }
     
    }

   }
   

4. public class ConcretePrototype extends Prototype{

    public ConcretePrototype(Object object) {
     
     // TODO Auto-generated constructor stub
     if(object instanceof User){
      setUser((User)object);
     }else {
      setStu((Stu) object);
     }
    }

   }

5.  

   package prototype;

   public class TestMain {

    public static void main(String[] args) {
     // TODO Auto-generated method stub
     User user= new User();
     user.setAge(44);
     user.setName("tttt");
     Stu stu = new Stu();
     stu.setName("Stu");
     stu.setScores(200);
     Prototype prototype = new ConcretePrototype(user);
     Prototype prototype2 = (Prototype) prototype.clone();
     //克隆后不是两个不同的对象
     System.out.println(prototype==prototype2);
     System.out.println(prototype.getUser());
     System.out.println(prototype2.getUser());
     prototype2.getUser().setAge(666);
     System.out.println(prototype.getUser());
     System.out.println(prototype2.getUser());
     System.out.println("======================");
     Prototype prototypeStu = new ConcretePrototype(stu);
     Prototype prototype2Stu = (Prototype) prototypeStu.clone();
     System.out.println(prototypeStu.getStu());
     System.out.println(prototype2Stu.getStu());
    
    }

   }