"Java design mode" "Create mode creational pattern" Construction Mode builder pattern

1  PackageCom.tn.pattern;2 3  Public classClient {4      Public Static voidMain (string[] args) {5Director director=director.getinstance ();6Director.construct (NewConcreteBuilder1 ()); 7Director.construct (NewConcreteBuilder2 ());8     }9 }Ten  One classdirector{ A     StaticDirector director; -     PrivateDirector () {} -      Public StaticDirector getinstance () { the         if(director==NULL) -Director=NewDirector (); -         returnDirector; -     } +      Public voidconstruct (Builder builder) { - Builder.buildpart1 (); + Builder.buildpart2 (); A     } at } -  - Interfacebuilder{ -     voidBuildPart1 (); -     voidBuildPart2 (); - Product Retrieveresult (); in } -  to classConcreteBuilder1Implementsbuilder{ + product product; - @Override the      Public voidBuildPart1 () { *System.out.println ("Concretebuilder1.buildpart1 ()"); $product=NewProduct1 ();Panax Notoginseng     } -      the @Override +      Public voidBuildPart2 () {} A      the @Override +      PublicProduct Retrieveresult () { -         returnproduct; $     } $ } -  - classConcreteBuilder2Implementsbuilder{ the product product; - @OverrideWuyi      Public voidBuildPart1 () {} the      - @Override Wu      Public voidBuildPart2 () { -System.out.println ("Concretebuilder2.buildpart2 ()"); Aboutproduct=NewProduct2 (); $     } -      - @Override -      PublicProduct Retrieveresult () { A         returnproduct; +     } the } -  $ Interfaceproduct{} the  the classProduct1Implementsproduct{ the      PublicProduct1 () { theSystem.out.println ("Product1.product1 ()"); -     } in } the  the classProduct2Implementsproduct{ About      PublicProduct2 () { theSystem.out.println ("Product2.product2 ()"); the     } the}

"Java design mode" "Create mode creational pattern" Construction Mode builder pattern