结构

描述原型设计模式的UML类图

实现

Java

/** Prototype Class **/publicclassCookieimplementsCloneable{publicObjectclone()throwsCloneNotSupportedException{//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 **/publicclassCoconutCookieextendsCookie{}/** Client Class**/publicclassCookieMachine{privateCookiecookie;//cookie必须是可复制的publicCookieMachine(Cookiecookie){this.cookie=cookie;}publicCookiemakeCookie(){try{return(Cookie)cookie.clone();}catch(CloneNotSupportedExceptione){e.printStackTrace();}return;}publicstaticvoidmain(Stringargs[]){CookietempCookie=;Cookieprot=newCoconutCookie();CookieMachinecm=newCookieMachine(prot);//设置原型for(inti=0;i<100;i++)tempCookie=cm.makeCookie();//通过复制原型返回多个cookie }}

引用

来源

Gamma, Erich; Helm, Richard; Johnson, Ralph; Vlissides, John. Design Patterns: Elements of Reusable Object-Oriented Software. Addison-Wesley. 1994. ISBN 0-201-63361-2.

参见

函数原型

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