原型模式

 /** Prototype Class **/
 public class Cookie implements Cloneable {
   
    public Object clone() throws CloneNotSupportedException
    {
        //In an actual implementation of this pattern you would now attach references to
        //the expensive to produce parts from the copies that are held inside the prototype.
        return (Cookie) super.clone();
    }
 }
 
 /** Concrete Prototypes to clone **/
 public class CoconutCookie extends Cookie { }
 
 /** Client Class**/
 public class CookieMachine
 {
 
   private Cookie cookie;//cookie必须是可复制的
 
     public CookieMachine(Cookie cookie) { 
         this.cookie = cookie; 
     } 

    public Cookie makeCookie()
    {
        try
        {
            return (Cookie) cookie.clone();
        } catch (CloneNotSupportedException e)
        {
            e.printStackTrace();
        }
        return null;
    } 

 
     public static void main(String args[]){ 
         Cookie tempCookie =  null; 
         Cookie prot = new CoconutCookie(); 
         CookieMachine cm = new CookieMachine(prot); //设置原型
         for(int i=0; i<100; i++) 
             tempCookie = cm.makeCookie();//通过复制原型返回多个cookie 
     } 
 }