Interview Questions and Answers

SOLID is an acronym for five design principles: Single Responsibility, Open-Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion.

Example:

Single Responsibility: A class should have only one reason to change. Open-Closed: Software entities should be open for extension but closed for modification.

Database normalization is the process of organizing data in a database to reduce redundancy and dependency. It ensures data integrity and reduces the chances of anomalies during data manipulation.

Example:

Breaking down a large table into smaller tables and establishing relationships to eliminate redundant data in a relational database.

Virtual functions in C++ allow dynamic method binding, enabling the selection of the appropriate method at runtime based on the object's type. They contribute to polymorphism by enabling runtime method resolution.

Example:

Declaring a virtual function in a base class and providing specific implementations in derived classes.

A deadlock occurs when two or more threads are blocked forever, each waiting for the other to release a resource. Deadlocks can be prevented by using techniques such as resource allocation graphs and avoiding circular wait conditions.

Example:

Illustrating a deadlock scenario with two threads competing for resources without proper synchronization.

The 'volatile' keyword in Java is used to indicate that a variable's value may be changed by multiple threads simultaneously. It differs from other synchronization mechanisms by ensuring visibility without acquiring locks.

Example:

Declaring a variable as 'volatile' in Java to ensure proper visibility in a multithreaded environment.

MVC separates an application into three interconnected components: Model (data and business logic), View (user interface), and Controller (handles user input and updates the model). It facilitates modular design by isolating concerns and promoting code reusability.

Example:

Implementing an MVC architecture in a web application with separate classes for the model, view, and controller.