Capital Numbers Infotech Dot Net Developer Trainee Interview Questions and Answers

Q1. Why strings are immutable
Ans. 
Strings are immutable to ensure data integrity and security by preventing accidental or intentional modification.
• Immutable strings prevent accidental changes to data

• Enhances security by preventing data tampering

• Allows for efficient memory management
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Q2. Count the number of repeated words from the given string
Ans. 
Count the number of repeated words in a given string
• Split the string into words using a delimiter like space

• Create a hashmap to store word frequencies

• Iterate through the words and update the hashmap accordingly

• Count the number of words with frequency greater than 1
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Q1. What is difference between controller and rest controller
Ans. 
Controller is a general term for a component that handles user requests, while a REST controller specifically handles RESTful requests.
• Controller is a general term for a component that handles user requests in a web application

• REST controller specifically handles RESTful requests, following the principles of REST architecture

• REST controller typically returns data in JSON or XML format, while a regular controller may re
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Q2. Coding question to print highest salary of a employee
Ans. 
Print highest salary of an employee using coding
• Create an array of employee salaries

• Sort the array in descending order

• Print the first element of the sorted array as the highest salary
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Q3. Java 8 features
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Q4. What is jwt token
Ans. 
JWT token is a JSON web token used for securely transmitting information between parties as a compact and self-contained way.
• JWT stands for JSON Web Token

• It consists of three parts: header, payload, and signature

• It is commonly used for authentication and information exchange in web development
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Q5. Microservice how to interact with other microservice
Ans. 
Microservices interact with each other through APIs, messaging queues, or event-driven architecture.
• Use RESTful APIs for synchronous communication between microservices

• Implement messaging queues like RabbitMQ or Kafka for asynchronous communication

• Leverage event-driven architecture with tools like Apache Kafka or AWS SNS/SQS

• Consider using service mesh like Istio for managing communication between microservices
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Q1. Core java basic questions
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Basic Programming questions will be there

Q1. Why Java is most secured!?
Ans. 
Java is most secured due to its strong memory management, bytecode verification, and security manager.
• Java's strong memory management prevents buffer overflow and other memory-related vulnerabilities.

• Bytecode verification ensures that the code is safe to execute and prevents malicious code from running.

• Security manager allows fine-grained control over access to system resources.

• Java also has a robust set of security AP...read more
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Q2. Explain how Java program execute?
Ans. 
Java programs are executed by the Java Virtual Machine (JVM) which interprets and executes the bytecode generated by the Java compiler.
• Java source code is compiled into bytecode by the Java compiler

• The bytecode is platform-independent and can be executed on any device with a JVM

• The JVM interprets the bytecode and executes the instructions

• The JVM manages memory, handles exceptions, and provides other runtime services

• Exa
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Q1. Communication and basic technical questions
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Q1. What is abstract class?
Ans. 
Abstract class is a class that cannot be instantiated and may contain abstract methods.
• Cannot be instantiated directly

• May contain abstract methods that must be implemented by subclasses

• Can have both abstract and non-abstract methods

• Used for creating a template for other classes to inherit from
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Q2. What is sub query and Like operator?
Ans. 
A subquery is a query nested within another query, and the LIKE operator is used in SQL to search for a specified pattern in a column.
• A subquery is enclosed in parentheses and executed first before the main query.

• The result of a subquery can be used in comparison with the main query's result.

• The LIKE operator is used with the WHERE clause to search for a specified pattern in a column.

• The LIKE operator allows for wildca...read more
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Q1. Tell Me about Yourself
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills and ability to work in a team

• Completed multiple projects including a web-based inventory management system
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Q2. Question From OOPS Consept
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Q1. Ask About Web Form
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Q2. SQL Question like Relation
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Round duration - 140 minutes
Round difficulty - Medium

Test timing was at 2:00 pm , it was conducted in a college and the environment was good for the test. Camera was a primary part of test, so no suspicious activity.

Q1. 
Sum of Two Numbers Represented as Arrays
Given two numbers in the form of two arrays where each element of the array represents a digit, calculate the sum of these two numbers and return this sum as an ar...read more
Ans. 
Given two numbers represented as arrays, calculate their sum and return the result as an array.
• Iterate through the arrays from right to left, adding digits and carrying over if necessary

• Handle cases where one array is longer than the other by considering the remaining digits

• Ensure the final sum array does not have any leading zeros
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Round duration - 20 minutes
Round difficulty - Easy

The round was conducted at around 12 p.m. I was called at the college location and then it was conducted. The interviewer was quite polite and frank.

Round duration - 8 minutes
Round difficulty - Easy

This round was conducted right after finishing and clearing the technical round at the same place and on the same day.