Java design pattern-creation mode-prototype mode

Prototype mode:

1 prototype Mode2 Overview3 Use the prototype instance to specify the kind of object to create and create a new object by copying the prototypes. 4     5 Applicability6     1. When a system should be independent of its product creation, composition, and presentation. 7 8     2when the class to instantiate is specified at run time, for example, by dynamic loading. 9 Ten     3to avoid creating a factory class hierarchy that is parallel to the product class hierarchy.  One  A     4. When an instance of a class can have only one of several different state combinations.  -  - building the corresponding number of prototypes and cloning them may be more convenient than manually instantiating the class each time you use the appropriate state.  the      - participants -     1. Prototype - declares an interface for a clone itself.  +  -     2. Concreteprototype + implements the operation of a clone itself.  A  at     3. Client -Let a prototype clone itself to create a new object.

Test class:

1  Public classTest {2 3      Public Static voidMain (string[] args) {4Prototype Pro =NewConcreteprototype ("Prototype");5Prototype Pro2 =(Prototype) Pro.clone ();6 System.out.println (Pro.getname ());7 System.out.println (Pro2.getname ());8     }9     Ten}

1 /**2 * Declares a clone's own interface3  * @author 4  *5  */6  Public classPrototypeImplementscloneable {7 8     PrivateString name;9     Ten      Public voidsetName (String name) { One          This. Name =name; A     } -      -      PublicString GetName () { the         return  This. Name; -     } -  -      PublicObject Clone () { +         Try { -             return Super. Clone (); +}Catch(Exception e) { A e.printstacktrace (); at             return NULL; -         } -     } -}

1 /**2 * Implement a clone of its own operation3  * @author 4  *5  */6  Public classConcreteprototypeextendsPrototype {7 8      PublicConcreteprototype (String name) {9 setName (name);Ten     } One}

Java design pattern-creation mode-prototype mode