Java design mode GOF23 02 Factory mode

Package com.lz.factory.simpleFactory;/** * Supplement: Object-oriented Principles * OCP: (open and closed principle) adding new features should not modify the original code, but instead add a new class * DIP: (Dependency Reversal Principle) dependency programming * LOD: (Dimitri Law) reduces coupling, communicates only with necessary objects * Static Factory class {* Creator and Separation of callers * Simple factory problem: Adding a new feature requires a code change *} * Factory method class {* Code too Much *} * Comparison of the two * simple factory structure Code simpler * Factory method is more difficult to maintain * Summary: The factory method model conforms to the theoretical requirements but the actual use of more simple Factory mode selection *  */ Public classSimplefactory { Public StaticCar Createcar (String msg) {if(Msg.equals ("Jeep")) {            return NewJeep (); } Else if(Msg.equals ("BMW")) {            return NewBMW (); } Else {            return NULL; }    }}

Package com.lz.factory.simpleFactory; /* * Automotive Interface   */  Public Interface Car {    publicvoid  run ();}

 package com.lz.factory.simpleFactory;  public  class   BMW implements car{@Override  public  
   
    void  
     run () {System.  
    out . println (
     " 
    i am BWM  
     "    
    ); }}
   

Package com.lz.factory.simpleFactory;  Public class Jeep implements car{    @Override    publicvoid  run () {        System. out. println ("I am Jeep");}    }

Package com.lz.factory.simpleFactory; Public classTest01 { Public Static voidMain (string[] args) {Car BMW=NewBMW (); Car Jeep=NewJeep ();        Bmw.run ();        Jeep.run (); Car BMW1= Simplefactory.createcar ("BMW"); Car Jeep1= Simplefactory.createcar ("Jeep");        Bmw1.run ();    Jeep1.run (); }}

Factory Method Class:

Add a factory method to each of the classes

Package Com.lz.factory.factoryMethod; /*  */Publicinterface  carfactory {    Car createcar ();}

Java design mode GOF23 02 Factory mode