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Software Engi Interview Questions and Answers

Updated 24 Jun 2024

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Q1. A design pattern where a class is only created one instance at runtime.

Ans.

Singleton pattern ensures a class has only one instance created at runtime.

  • Ensures there is only one instance of the class by providing a global point of access to it.

  • Uses a private constructor to restrict instantiation of the class from other classes.

  • Commonly used in scenarios where only one instance of a class is needed, such as database connections or configuration settings.

Q2. What is OOPS principle

Ans.

OOPS principle stands for Object-Oriented Programming principles, which are a set of programming guidelines to help organize code and improve software design.

  • Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

  • Inheritance: Allowing a class to inherit properties and behavior from another class.

  • Polymorphism: The ability for objects of different classes to respond to the same message in different ways.

  • Abstraction: Hiding the complex imple...read more

Software Engi Interview Questions and Answers for Freshers

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Q3. What is a singleton?

Ans.

A singleton is a design pattern that restricts the instantiation of a class to one object.

  • Singleton pattern ensures that a class has only one instance and provides a global point of access to it.

  • Commonly used in scenarios where only a single instance of a class is needed, such as database connections or configuration settings.

  • Implementation can involve a private constructor, a static method to access the instance, and a static variable to hold the instance.

  • Example: Singleton ...read more

Q4. Describe OOP's in C#

Ans.

OOP in C# is a programming paradigm that uses classes and objects to model real-world entities.

  • OOP stands for Object-Oriented Programming

  • In C#, classes are used to define objects which have properties and methods

  • Encapsulation, inheritance, and polymorphism are key principles of OOP in C#

  • Example: class Car { string make; int year; void Start() { } }

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