Java design Pattern--a singleton pattern of creating patterns

I. Overview

　　Concept

Decoupling abstraction from implementation so that abstractions and implementations can run independently

　UML diagram

　　

Role:

　　

　　role Relationship

　　

Second, practice

　　Set up the appropriate classes according to the roles above

　　Abstract roles

/**@author  Administrator * **/publicabstractclass  Abstraction {    protected  implenmentor impl;          Public void operation () {        impl.operationimpl ();    }}

　　Correcting abstract roles

/**@author  Administrator * **/Publicclassextends  abstraction{    @Override    publicvoid  operation () {         // Fix Logic        SYSTEM.OUT.PRINTLN ("Fix abstract role");}    }

　　Implementation of the role (interface form)

/**@author  Administrator * **/publicabstractclass  implenmentor {    publicabstractvoid  Operationimpl ();}

　Implement a specific role (give only one example, you can have more than one specific implementation)

/**@author  Administrator * **/Publicclassextends  implenmentor{    @Override    publicvoid  Operationimpl () {         //  Subclass rewrite logic        System.out.println ("Concrete implementation Subclass");}    }

Java design Pattern--a singleton pattern of creating patterns