Java simple factory, factory method, how to implement abstract factory pattern
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1. Simple factory model 1. Define
Simple factory pattern (Simple Factory Pattern) means that an instance of a product class is determined by a factory object.
It belongs to the creative pattern, but it does not belong to the GOF23 design pattern.
two。 Code case
Let's take the manufacturing of canned products as a case study.
Step 1: define the top-level interface class ICanned for cans
/ * @ Package: com.hzg.study.design.pattern.factory.simplefactory * @ Description: interface on the top level of cans * @ Author: HuangZhiGao * @ CreateDate: 2022-02-17 17:52 * / public interface ICanned {/ * display the name of cans * @ return void * @ author HuangZhiGao * @ date 2022 2Gash 1717 17:54 * / void showCannedName ();}
Step 2: write two specific implementation classes FruitCanned and BeefCanned respectively
/ * * @ Package: com.hzg.study.design.pattern.factory.simplefactory * @ Description: canned fruit * @ Author: HuangZhiGao * @ CreateDate: 2022-02-17 17:56 * / public class FruitCanned implements ICanned {@ Override public void showCannedName () {System.out.println ("name: canned fruit") } / * * @ Package: com.hzg.study.design.pattern.factory.simplefactory * @ Description: canned beef * @ Author: HuangZhiGao * @ CreateDate: 2022-02-17 17:57 * / public class BeefCanned implements ICanned {@ Override public void showCannedName () {System.out.println ("name: canned beef");}}
Step 3: write the factory class
Import com.hzg.study.design.pattern.factory.common.ICanned / * @ Package: com.hzg.study.design.pattern.factory.simplefactory * @ Description: cannery class * @ Author: HuangZhiGao * @ CreateDate: 2022-02-17 18:16 * / public class CannedFactory {/ * method for creating cans * @ param clazz * @ return com.hzg.study.design.pattern.factory.common.ICanned * @ author HuangZhiGao * @ date 2022 * public ICanned createCanned (Class)
