It’s not required for our application to have a Director class. It specifies the order of building steps, while a ConcreteBuilder provides the implementation for those steps. The Director class’s responsibility is to create an object using the Builder interface. ![]() The standard UML diagram for the Builder Design Pattern looks like this: It’s obvious that things are getting complicated, so why not delegate the job to a specialized component? This is the point at which the builder (or a carpenter if you want) enters the stage. Additionally, there are specific details about the table plate, handlers, legs (binding components, screws, and rollers), and maybe more. Each variant should have a set of predefined dimensional values and/or colors, and the code for the Builder was changed to implement this approach. In the sample for the Abstract Factory, the MakeCoffeeTable() method implementation for each variant is naive, taking some arguments to customize the product’s size and color, this approach being far from reality. Each furniture piece or set is manufactured upon request from a Client. Different products like armchairs, sofas, and coffee tables are available for each variant. ![]() The furniture shop application is capable of producing furniture sets in different variants, like Modern, Classic, and Retro. This time, to keep things simple, the focus will be on just one product, the coffee table, but the same approach can be used to build the other sample products. ![]() We are going to extend the furniture shop application introduced in the post related to Abstract Factory. How and why the Builder Design Pattern is used: an example of implementation
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