Key Concepts

• Separation of Concerns: Separates the construction of an object from its final representation.
• Builder Interface: Defines methods for constructing each part of the product.
• Concrete Builders: Implements the Builder interface to build specific representations of the product.
• Director (Optional): Coordinates the construction process using a builder object.
• Product: Represents the complex object that is being constructed.

Benefits

• Flexibility: Allows for the creation of complex objects step by step, providing flexibility to vary the object's internal representation.
• Separation of Concerns: Separates the construction of an object from its final representation, making the construction process more manageable and reusable.
• Encapsulation: Hides the construction details of objects from clients, promoting a clean API and reducing dependencies on concrete implementations.
• Consistent Construction: Ensures that the same construction process can be used to create different representations of the object, maintaining consistency across variations.
• Complexity Handling: Manages the complexity of creating complex objects by breaking down the construction process into smaller, manageable steps.

Structure

• Product: Represents the complex object that is being constructed. Contains multiple parts and their assembly methods.
• Builder Interface: Defines methods for creating each part of the product. Abstract interface that concrete builders implement.
• Concrete Builder: Implements the builder interface to construct and assemble parts of the product. Provides specific implementations for each construction step. Constructs and returns the final product.
• Director (Optional): Controls the construction process using a builder object. Defines the order and sequence of steps to create the product. Constructs the final object using the builder's methods.