Druva Staff Software Engineer Interview Questions and Answers

Print a specific pattern using any programming language.

Q1. What is a class in Object-Oriented Programming (OOP)?
Ans. 
A class in OOP is a blueprint for creating objects, defining their properties and behaviors.
• Classes are templates for creating objects in OOP

• They define the properties (attributes) and behaviors (methods) of objects

• Objects are instances of classes, each with its own unique data

• Inheritance allows classes to inherit properties and behaviors from other classes

• Encapsulation ensures that the data is hidden and can only be a...read more
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Q2. What is the difference between an abstract class and an interface?
Ans. 
Abstract class can have both abstract and non-abstract methods, while interface can only have abstract methods.
• Abstract class can have constructors, fields, and methods, while interface cannot have any implementation.

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

• Abstract classes are used to define common characteristics of subclasses, while interfaces are used to define contracts for...read more
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Q3. What is joining and creating an inner join query?
Ans. 
Joining is combining data from two or more tables based on a related column, while an inner join query retrieves only the matching records.
• Joining is used to combine data from multiple tables in a database.

• Inner join query retrieves only the records that have matching values in both tables.

• Syntax for inner join: SELECT columns FROM table1 INNER JOIN table2 ON table1.column = table2.column;

• Example: SELECT orders.order_i...read more
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Q1. Starts with a introduction, Core Java concepts, OOPS concepts, Singleton design pattern, Spring boot annotations like service, restcontroller.
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Q2. DSA logical questions like 2nd highest number. How to find missing number from an array.
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Q1. Tell me about yourself.
Ans. 
I am a software engineer with 5 years of experience in developing web applications using Java, Spring Boot, and Angular.
• 5 years of experience in software development

• Proficient in Java, Spring Boot, and Angular

• Strong problem-solving skills

• Experience working in Agile development environment

• Bachelor's degree in Computer Science from XYZ University
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Q2. Tell me about your family.
Ans. 
I come from a close-knit family of five, including my parents, older sister, and younger brother.
• Close-knit family of five

• Parents, older sister, and younger brother

• We enjoy spending time together traveling and trying new restaurants
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Q3. Why do you want to change the company
Ans. 
Seeking new challenges and opportunities for growth in a different environment.
• Desire for new challenges and learning opportunities

• Seeking a better work-life balance

• Interested in working with new technologies or industries

• Looking for a more collaborative team environment
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Q4. After that interviewer describes my work and position in the company.
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Q1. What is CICD ?
Ans. 
CICD stands for Continuous Integration and Continuous Deployment. It is a software development practice where code changes are automatically built, tested, and deployed.
• Automates the process of integrating code changes into a shared repository

• Automatically builds and tests the code to ensure it is functional

• Automatically deploys the code to production or staging environments

• Helps in detecting and fixing integration err
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Q2. How to create image out of running container ?
Ans. 
To create an image out of a running container, you can use the 'docker commit' command.
• Use 'docker commit' command to create an image from a running container

• Syntax: docker commit [OPTIONS] CONTAINER [REPOSITORY[:TAG]]

• Example: docker commit container_id repository_name:tag
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Q3. What is the difference between docker add and copy command?
Ans. 
Docker add command can fetch a file from a URL and add it to the image, while copy command copies files from the host machine to the image.
• Docker add command can fetch files from URLs and add them to the image

• Copy command copies files from the host machine to the image

• Add command can also automatically extract compressed files during the build process

• Copy command is more commonly used for copying local files
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Q4. What is freestyle project and pipeline ?
Ans. 
A freestyle project is a type of project in Jenkins that allows users to configure the build process in any way they want. A pipeline is a set of automated steps that define the process for building, testing, and deploying code.
• Freestyle project in Jenkins allows users to configure build process manually

• Pipeline in Jenkins is a set of automated steps for building, testing, and deploying code

• Freestyle projects are more ...read more
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Q5. What is the difference between docker swarm and docker compose ?
Ans. 
Docker Swarm is used for orchestrating multiple Docker containers across multiple hosts, while Docker Compose is used for defining and running multi-container Docker applications.
• Docker Swarm is a container orchestration tool that allows you to manage a cluster of Docker hosts.

• Docker Compose is a tool for defining and running multi-container Docker applications.

• Docker Swarm is used for scaling and managing a cluster of...read more
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Q1. What is the project you worked can you plz explain?
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Q2. What is VPC ?
Ans. 
VPC stands for Virtual Private Cloud, a virtual network dedicated to a single organization's resources in the cloud.
• Allows organizations to have control over their virtual network environment

• Enables customization of network configuration

• Provides security by allowing isolation of resources

• Can connect to on-premises data centers or other VPCs using VPN or Direct Connect
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Q3. What is CICD pipeline and its stages ?
Ans. 
CICD pipeline is a process that automates the building, testing, and deployment of software.
• Continuous Integration (CI) - code changes are integrated into a shared repository multiple times a day.

• Continuous Testing - automated tests are run to ensure code quality.

• Continuous Deployment - code changes are automatically deployed to production.

• Stages include: build, test, deploy, and monitor.

• Tools like Jenkins, GitLab, and
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Q4. VPC peering concept ?
Ans. 
VPC peering allows connecting two VPCs to communicate using private IP addresses.
• VPC peering enables instances in different VPCs to communicate as if they are within the same network.

• Traffic between peered VPCs stays within the private IP space and does not traverse the internet.

• VPC peering does not involve a gateway, VPN, or direct connection.

• Both VPCs must have non-overlapping IP ranges for successful peering.

• Example...read more
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Q5. Whole concept of VPC , subnet and route table and NAT gateway ?
Ans. 
VPC is a virtual private cloud that allows you to create isolated networks within the cloud environment. Subnets are subdivisions of a VPC, route tables define how traffic is directed within the VPC, and NAT gateway allows instances in a private subnet to access the internet.
• VPC is a virtual private cloud that provides a logically isolated section of the AWS Cloud where you can launch resources.

• Subnets are subdivisions...read more
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Q1. Basics Quesestions?
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There were 30 questions on the aptitude test, all of which were part of the total count.

I have three questions: two related to data structures and algorithms, and one concerning SQL.

Q1. Got two questions DSA medium and Easy one
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Leet code medium level question

Q1. About Java Streams
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Q2. Restful API coding completion based on given file
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Q1. To check your attitude
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Q2. Given detailed about company and what project you are going to work on?
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Q1. Hashmap working
Ans. 
Hashmap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.
• Hashmap uses a hashing function to map keys to indices in an array.

• It allows for constant time complexity O(1) for insertion, deletion, and retrieval operations.

• Example: HashMap<String, Integer> map = new HashMap<>(); map.put("key", 123); int value = map.get("key");
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Q2. Multithreading cases
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Q3. Scenario specific on how to handle multiple events on a single variable to have accurate result
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Q4. Database indexing
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Q5. Architecture level
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Q1. Springboot notations
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Q2. How to handle multiple request on springboot
Ans. 
Use thread pooling and asynchronous processing to handle multiple requests efficiently in Spring Boot.
• Implement thread pooling to manage multiple requests concurrently.

• Use asynchronous processing to handle requests without blocking the main thread.

• Consider using reactive programming with Spring WebFlux for better scalability.

• Optimize database queries and external API calls to reduce response times.

• Implement caching mec...read more
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Ge general attitude and HTML CSS JavaScript Java questions

Q1. What is server and abap server
Ans. 
A server is a computer or software that provides functionality for other programs or devices. ABAP server is a server that runs ABAP programs.
• A server is a computer or software that provides services or resources to other computers or programs.

• ABAP server is a server that runs ABAP (Advanced Business Application Programming) programs, commonly used in SAP systems.

• ABAP server handles requests from clients and executes A...read more
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