The 4P Solutions Interview Questions and Answers

Abstract classes can have implementation details while interfaces cannot.

• Abstract classes can have method implementations while interfaces cannot.

• A class can inherit only one abstract class but can implement multiple interfaces.

• Abstract classes can have access modifiers on their members while interfaces cannot.

• Interfaces are used to define a contract for classes to implement.

• Abstract classes are used to provide a common base for related classes.

The different components of DOT-NET include Common Language Runtime (CLR), Framework Class Library (FCL), and ASP.NET.

• Common Language Runtime (CLR) - provides various services such as memory management, exception handling, and security.

• Framework Class Library (FCL) - a collection of reusable classes, interfaces, and value types that provide access to system functionality.

• ASP.NET - a web application framework for building dynamic web sites, web applications, and web services.

• A...read more

A pipeline is a series of interconnected steps or stages in a process, where output of one step is input to the next step.

• Pipeline is commonly used in software development for continuous integration and continuous delivery processes.

• Each step in the pipeline performs a specific task, such as building, testing, and deploying code.

• Pipeline automation tools like Jenkins, GitLab CI/CD, and Azure DevOps help in managing and executing pipelines efficiently.

Method overloading is when multiple methods in a class have the same name but different parameters.

• Allows multiple methods with the same name but different parameters to be defined in a class

• Parameters can differ in number, type, or order

• Example: void print(int num) and void print(String text) are overloaded methods

Method overriding is a feature in object-oriented programming that allows a subclass to provide a specific implementation of a method that is already provided by its superclass.

• Method overriding is done when a subclass provides a specific implementation for a method that is already defined in its superclass.

• The method in the subclass must have the same name, return type, and parameters as the method in the superclass.

• Method overriding is used to achieve runtime polymorphism i...read more

A singleton class is a class that can only have one instance created and provides a global point of access to that instance.

• Singleton classes are often used for logging, caching, database connections, and thread pools.

• They typically have a private constructor to prevent instantiation from outside the class.

• The class itself usually provides a static method to access the single instance.

Oops Pillars are the four main concepts of Object-Oriented Programming: Inheritance, Encapsulation, Polymorphism, and Abstraction.

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

• Encapsulation: Bundles data and methods into a single unit, protecting data from outside interference.

• Polymorphism: Allows objects to be treated as instances of their parent class, enabling flexibility in code.

• Abstraction: Hides complex implementation details, focusin...read more

Dependency injection is a design pattern in which components are given their dependencies rather than creating them internally.

• Allows for easier testing by mocking dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection