ValueLabs Technical Consultant Interview Questions and Answers

Concurrency is the ability of a program to execute multiple tasks simultaneously.

• Achieved through multi-threading or asynchronous programming

• Requires careful management of shared resources to avoid race conditions

• Examples include implementing a chat application or processing multiple requests simultaneously

Interface defines a contract while abstract class provides partial implementation.

• Interfaces can only have abstract methods while abstract classes can have both abstract and non-abstract methods.

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

• Interfaces are used for loose coupling while abstract classes are used for code reusability.

• Example of interface: Runnable interface in Java...read more

Method overloading is when a class has multiple methods with the same name but different parameters.

• Method overloading allows for flexibility in method calls

• The methods must have different parameters, such as different data types or different numbers of parameters

• Example: public void print(int num) and public void print(String str)

• The compiler determines which method to call based on the arguments passed

Indexing in SQL Server database

• Indexing improves query performance by creating a structure that allows for faster data retrieval

• Clustered and non-clustered indexes are the two types of indexes in SQL Server

• Clustered indexes determine the physical order of data in a table while non-clustered indexes create a separate structure

• Indexing should be done strategically to avoid over-indexing which can slow down data modificat

Core Java is a programming language, Spring Boot is a framework for building web applications, and Microservices is an architectural style for building distributed systems.

• Core Java is used for developing standalone applications and is the foundation for many other Java frameworks.

• Spring Boot is a popular framework for building web applications that simplifies the development process.

• Microservices is an architectural s...read more

A string is a sequence of characters. It is used to store and manipulate text.

• Strings are enclosed in quotes, either single or double.

• They can be concatenated using the + operator.

• String methods include length(), indexOf(), and substring().

• Examples: 'Hello, world!', '1234', 'This is a string.'