Builder of Design Patterns

There are 23 modes in the design pattern. This is just for one purpose: decoupling + decoupling + decoupling ... ( cohesion poly-low coupling satisfies the opening and closing principle)

Introduced:

The builder mode is a step-by-step creation of a complex object that allows the user to specify only complex objects.

Separating the construction of a complex object from its representation allows the same build process to create different representations.

Pattern structure:

First, let's look at the builder code:

 Public InterfaceBuilder {//creating a part A such as creating a car wheel 　　 voidBuildparta (); //creating a part B such as creating a car steering wheel 　　 voidBUILDPARTB (); //creating a part C such as creating a car engine 　　 voidBUILDPARTC (); //returns the final assembly of the finished product (back to the last assembled car)//the assembly process for the finished product is not carried out here, but instead is transferred to the following Director class. //thus realizing the understanding of the coupling process and componentsProduct GetResult ();}

Next, let's take a look at the command director.

 Public class　　Director {  private  builder Builder; 　　  public Director (Builder builder) {  this. Builder = Builder; }  //  parts Parta partB PARTC final composition complex object  // This is the process of assembling the wheel steering wheel and the engine into a car. public 　　　　 void  construct () {Builder.buildparta ();　　　　BUILDER.BUILDPARTB ();　　BUILDER.BUILDPARTC (); }}　　

And then the concrete builder.

 Public classConcreteBuilderImplementsBuilder {Part parta, PartB, PARTC;  Public voidBuildparta () {//here's how to build Parta code specifically};  Public voidBUILDPARTB () {//here's how to build PARTB code specifically};  Public voidBUILDPARTC () {//here's how to build PARTB code specifically};  PublicProduct GetResult () {//return to final assembly of finished product results}; }

In this way we only need to do this in the client code:

Newnew= Builder.getresult ();

Builder is relatively simple, if you have complex objects to create when you can apply the sub-mode, you can also use the Director to control the composition of complex objects, such as mail (including attachments, topics, content ...) ）

Builder of Design Patterns