20+ Top Interview Questions and Answers (2024)

Ques 1

What is the SOLID principle? Explain each principle briefly.

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.

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Ques 2

Explain the term 'database normalization.' Why is it important?

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.

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Ques 3

Explain the concept of virtual functions in C++. How do they contribute to polymorphism?

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.

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Ques 4

Explain the concept of a deadlock in concurrent programming. How can deadlocks be prevented?

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.

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Ques 5

What is the purpose of the 'volatile' keyword in Java? How does it differ from other synchronization mechanisms?

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.

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Ques 6

Explain the concept of the MVC (Model-View-Controller) design pattern. How does it facilitate modular software design?

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.

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Interview Questions and Answers

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Interview Questions and Answers

Experienced / Expert level questions & answers

What is the SOLID principle? Explain each principle briefly.

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Explain the term 'database normalization.' Why is it important?

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Explain the concept of virtual functions in C++. How do they contribute to polymorphism?

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Explain the concept of a deadlock in concurrent programming. How can deadlocks be prevented?

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What is the purpose of the 'volatile' keyword in Java? How does it differ from other synchronization mechanisms?

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Explain the concept of the MVC (Model-View-Controller) design pattern. How does it facilitate modular software design?

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