10+ TCS Interview Questions and Answers

OOPS, GC, Collection, Generics, Array, String, Ref & Out, Abstract class, Interface

• OOPS - Object-Oriented Programming Concepts

• GC - Garbage Collection, automatic memory management

• Collection - Group of objects

• Generics - Type-safe collection

• Array - Fixed-size collection of elements

• ArrayList - Dynamic collection of elements

• String - Immutable sequence of characters

• StringBuilder - Mutable sequence of characters

• Ref & Out - Parameter passing mechanisms

• Abstract class - Incomplete clas...read more

Debugging is the process of identifying and fixing errors in a program or project.

• Debugging involves analyzing code and identifying errors

• Tools like debuggers and logging can aid in the process

• Common errors include syntax errors, logic errors, and runtime errors

• Debugging should be done systematically and thoroughly

• Testing and retesting is important to ensure all errors are fixed

C# is a programming language used for developing software. Function overloading is having multiple functions with the same name but different parameters. Function overriding is redefining a function in a subclass.

• C# is a programming language developed by Microsoft for building software applications.

• Function overloading allows multiple functions with the same name but different parameters to be defined in a class.

• Function overriding is when a subclass provides a specific imple...read more

Accessibility of variable or function

• Variables and functions should be accessible to the parts of the code that need them

• Accessibility can be controlled using access modifiers like public, private, and protected

• Accessibility can also be affected by the scope of the variable or function

Log files are used to record events and actions in a system or application.

• Log files can be used for debugging and troubleshooting.

• They can also be used for auditing and compliance purposes.

• Log files can help identify security breaches or unauthorized access.

• They can be used to monitor system performance and identify bottlenecks.

• Log files can be analyzed to gain insights into user behavior and usage patterns.

The four pillars are principles that guide software development: flexibility, scalability, maintainability, and efficiency.

• Flexibility: Ability to adapt to changing requirements without major changes to the codebase.

• Scalability: Ability to handle increased workload or user base without sacrificing performance.

• Maintainability: Ease of understanding and modifying the code for future updates or bug fixes.

• Efficiency: Optimizing code for speed, memory usage, and resource utilizati...read more

Libuv is a multi-platform support library with a focus on asynchronous I/O.

• Provides event loop, networking, and file system access APIs

• Supports asynchronous operations for handling I/O events efficiently

• Used in Node.js for handling non-blocking I/O operations

Basic OOP concepts include encapsulation, inheritance, and polymorphism.

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

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

• Polymorphism: ability for objects of different classes to respond to the same method call

To connect with a database in Spring Boot, you can use Spring Data JPA or JDBC templates.

• Use Spring Data JPA for easy database access and mapping entities to tables

• Configure database connection properties in application.properties file

• Use @Repository annotation to mark the repository classes

• Example: @Repository interface UserRepository extends JpaRepository {}

The architecture of the current project is based on microservices and follows a containerized approach.

• Utilizes microservices architecture for scalability and flexibility

• Uses containers for easy deployment and management

• Decoupled components communicate via APIs

Async programming in JS allows for non-blocking operations, improving performance and user experience.

• Use async/await to write asynchronous code in a synchronous manner

• Promises are a common way to handle asynchronous operations

• Callbacks can also be used for async programming, but can lead to callback hell

• Utilize setTimeout and setInterval for delayed and repeated tasks