The builder pattern for Java design patterns

Builder mode: The construction of a complex object is separated from its representation, allowing the same build process to create different representations.

Simple example:

1  Public classProduct2 {3     PrivateString Parta;4     PrivateString PartB;5     6      Public voidSetparta (String parta)7     {8          This. Parta =Parta;9     }Ten  One      Public voidSETPARTB (String PartB) A     { -          This. PartB =PartB; -     } the      - @Override -      PublicString toString () -     { +         return"[Parta =" + Parta + ", PartB =" + PartB + "]"; -     } + } A  at  Public InterfaceFactory - { -      Public voidinit (); -      Public voidBuildparta (); -      Public voidBUILDPARTB (); -      PublicProduct getproduct (); in } -  to  Public classFactory1a2bImplementsFactory + { -     Privateproduct product; the      * @Override $      Public voidInit ()Panax Notoginseng     { -Product =NewProduct (); the     } +      A @Override the      Public voidBuildparta () +     { -Product.setparta ("1"); $     } $  - @Override -      Public voidBUILDPARTB () the     { -PRODUCT.SETPARTB ("2");Wuyi     } the  - @Override Wu      PublicProduct getproduct () -     { About         returnproduct; $     } - } -  -  Public classDirector A { +     PrivateFactory Factory =Newfactory1a2b (); the      -      PublicProduct newproduct () $     { the factory.init (); the Factory.buildparta (); the FACTORY.BUILDPARTB (); the         returnfactory.getproduct (); -     } in } the  the  Public classTest About { the      Public Static voidMain (string[] args) the     { theDirector Director =NewDirector (); + System.out.println (Director.newproduct ()); -     } the}

The builder pattern for Java design patterns