Lenovo Backend Developer Interview Questions and Answers

I have used the Singleton and Factory design patterns in my project.

• Singleton pattern is used to ensure only one instance of a class is created and provide a global point of access to it.

• Factory pattern is used to create objects without exposing the creation logic to the client and refer to newly created object using a common interface.

Design patterns hold good in scenarios where a common problem needs to be solved in a reusable and maintainable way.

• Design patterns provide solutions to recurring problems in software development

• They promote code reusability and maintainability

• They are applicable in various scenarios such as object creation, behavior control, and communication between objects

• Examples of design patterns include Singleton, Factory, Obser