The builder pattern is a design pattern that provides a flexible solution to various object creation problems in object-oriented programming. The builder pattern separates the construction of a complex object from its representation. It is one of the 23 classic design patterns described in the book Design Patterns and is sub-categorized as a creational pattern.

The builder design pattern solves problems like:

Creating and assembling the parts of a complex object directly within a class is inflexible. It commits the class to creating a particular representation of the complex object and makes it impossible to change the representation later independently from (without having to change) the class.

The builder design pattern describes how to solve such problems:

A class (the same construction process) can delegate to different Builder objects to create different representations of a complex object.

The intent of the builder design pattern is to separate the construction of a complex object from its representation. By doing so, the same construction process can create different representations.

Advantages of the builder pattern include:

Disadvantages of the builder pattern include: