Nayeem Azad

Dependency Inpervion Principle is one of the SOLID design principle. It states following two thing:

1. High-level modules should not depend on low-level modules. Both should depend on the abstraction.
2. Abstractions should not depend on details. Details should depend on abstractions.

Builder pattern is a creational design pattern which separates the contruction process of complex objects from its representation so that same contruction process can create different representation.

Singleton pattern is a creational software design pattern that restricts the instantiation of a class to one “single” instance. This is useful when exactly one object is needed to coordinate actions across the system. It also provides a global endpoint to access the single instance.

Factory Method design pattern is a creational pattern which defines an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.