From buying a hard disk, the builder mode + VB.net implementation

I am planning to buy a mobile hard drive recently. Do I buy a brand or assemble it? Because it is not very wealthy and there is no such high requirement, buy an assembly. Cheaper.

Recently, I am still looking at the design mode. I think the builder mode is similar to the appearance mode. Therefore, after careful comparison, we will use the builder to buy a hard disk.

First look at the figure:

Let's look at a specific implementation:

Module module1 <br/> sub main () <br/> console. writeline ("boss, I want to assemble a hard disk. ") <Br/> dim D as new ctor <br/> D. givehd () <br/> console. writeline (" BOSS: 'quality is absolutely good... '") <Br/> console. readkey () <br/> end sub <br/> end module <br/> 'first sets up a boss class, that is, Director <br/> public class director <br/> private abuilder as builder <br/> Public sub givehd () <br/> abuilder = new hdbuilder <br/> console. writeline ("small A, get a hard disk box .... ") 'This is added to describe the process and does not need to be added <br/> abuilder. buildparta () <br/> console. writeline ("Small B, get a hard disk core... ") 'This is added to describe the process and does not need to be added <br/> abuilder. buildpartb () <br/> console. writeline (abuilder. getresult) <br/> end sub <br/> end class <br/> 'creates an abstract worker, that is, builder <br/> Public mustinherit class builder <br/> Public mustoverride sub buildparta () <br/> Public mustoverride sub buildpartb () <br/> Public mustoverride function getresult () as string <br/> end class <br/> 'specific worker, that is, entity builder <br/> public class hdbuilder: Inherits builder <br/> private product as new product <br/> Public overrides sub buildparta () <br/> console. writeline ("gives you a hard disk box ..... ") <Br/> end sub <br/> Public overrides sub buildpartb () <br/> console. writeline (" to your hard disk core ..... ") <Br/> end sub <br/> Public overrides function getresult () as string <br/> return product. getresult <br/> end function <br/> end class <br/> 'creates a product class <br/> public class product <br/> Public Function getresult () as string <br/> return "OK, the complete product is for you .... "<Br/> end function <br/> end class <br/> 'creates

Final result:

Boss, I have a hard disk to assemble.

Small A, get a hard disk box ....

Hard Disk box .....

Small B, get a hard disk core...

Hard Disk core .....

All right, the complete product is for you ....

Boss: 'quality is absolutely good... '

After such a process, I don't know if you find it. (If not, let's take a look at my previous blog post on drug purchasing.) The Builder model focuses on the specifications of the entire product process, however, the appearance mode is used to encapsulate a sub-system and provide a unified interface.

The following is a definition of the builder mode:

Builder mode: separates the construction of a complex object from its representation, so that different representations can be created during the same construction process.

In fact, I can add another computer buying process in the process of purchasing hard disks. What should I do if I add a computer buying process?

Let me show you a picture. (Suppose the computer is only composed of a chassis and a display ...)