Tvadartham Technologies Java Web Developer Interview Questions and Answers

Q1. No one showed up to interview
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Q2. Even they don’t responded to my mails
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Implementation of the Spring security

Q1. What is hashmap
Ans. 
HashMap is a data structure in Java that stores key-value pairs and allows fast retrieval of values based on keys.
• HashMap implements the Map interface in Java

• It allows null keys and values

• Keys in a HashMap must be unique

• Example: HashMap map = new HashMap<>()
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Q2. Internal Working of hashmap
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HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap uses the hashCode() method of keys to calc...read more
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Q3. Compare Throw vs Throws
Ans. 
Throw is used to explicitly throw an exception in a method, while Throws is used to declare the exceptions that a method may throw.
• Throw is used within a method to throw an exception explicitly.

• Throws is used in the method signature to declare the exceptions that the method may throw.

• Throw is followed by an instance of Throwable class, while Throws is followed by the exception class names separated by commas.

• Example: t...read more
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Q4. Array vs Arraylist
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Arrays are fixed in size, while ArrayLists can dynamically resize. ArrayLists provide more flexibility and functionality.
• Arrays have a fixed size, while ArrayLists can dynamically resize.

• ArrayLists can easily add, remove, or modify elements, while arrays require manual shifting of elements.

• Arrays use [] syntax for declaration and initialization, while ArrayLists use the ArrayList class from the Java Collections framewo
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Q5. Arraylist vs LinkedList/Vector
Ans. 
ArrayList is resizable array implementation, LinkedList is doubly linked list implementation, Vector is synchronized version of ArrayList.
• ArrayList is faster for accessing elements, LinkedList is faster for adding/removing elements in middle.

• ArrayList uses less memory than LinkedList due to contiguous memory allocation.

• Vector is thread-safe but slower than ArrayList due to synchronization overhead.
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Q6. Write a code for Iterate hashmap using iterator
Ans. 
Iterate through a hashmap using an iterator in Java
• Create an iterator using the entrySet() method of the hashmap

• Use a while loop to iterate through the hashmap entries

• Access the key and value of each entry using the getKey() and getValue() methods
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Q1. What are the advantages of spring boot
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Spring Boot provides a simplified way to create stand-alone, production-grade Spring-based Applications.
• Rapid application development

• Embedded server for easy deployment

• Auto-configuration for setting up Spring projects quickly

• Microservices support

• Actuator for monitoring and managing applications
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Q2. Java oops concept and sql questions
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Q1. Questions on the current project
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Q2. Microservices architecture in spring microservices
Ans. 
Microservices architecture in Spring is a way of designing software applications as a collection of loosely coupled services.
• Microservices architecture breaks down a large application into smaller, independent services that can be developed, deployed, and scaled independently.

• Spring Boot and Spring Cloud are commonly used frameworks for building microservices in Java.

• Each microservice typically has its own database and...read more
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For freshers there is online aptitude test.

Coding round is done by interviewers on live screen sharing

Q1. Here they discuss about projects and work in depth.
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Q1. Tell me about yourself? What are your hobbies? If you get chance to work with our company what is your expectations from us?
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Q2. Discuss about policies and work culture
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Q1. In java How hasmap works internally
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values.
• HashMap uses an array of buckets to store key-value pairs

• The hash code of the key is used to determine the index of the bucket

• If multiple keys have the same hash code, they are stored in a linked list within the bucket

• HashMap allows null keys and values

• HashMap is not thread-safe and requires synchronization for concurrent access
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Q2. Write program in java to print even no by one thread and odd no by another thread
Ans. 
Program to print even and odd numbers using two threads in Java
• Create two threads, one for even numbers and one for odd numbers

• Use a loop to generate numbers and check if they are even or odd

• Print the numbers using the respective threads

• Use synchronization to ensure alternate printing of even and odd numbers
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Q1. Project, rolls and responsibilities
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Q2. Core java questions
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Q3. Java 8 new features and coding questions
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Q4. Spring boot knowledge check
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Q5. Microservices architecture and scenario based questions related to architecture
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Q6. Sql query basic questions
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Q1. Current project rolls and technical stack
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Q2. Microservices related questions, cloud, deployment on cloud.
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Q3. Area of interest for new techniques
Ans. 
My area of interest for new techniques includes cloud computing, machine learning, and microservices architecture.
• Cloud computing: Interested in exploring AWS, Azure, and Google Cloud Platform for scalable and cost-effective solutions.

• Machine learning: Excited about implementing algorithms for data analysis and predictive modeling.

• Microservices architecture: Looking into breaking down monolithic applications into small...read more
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Q1. It was most lengthy than technical round they asked more about current role and how we handle the any kind of situations in work.
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Q2. Question related to thought process of candidates
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Q3. Assurance and willingness of candidates to join wipro
Ans. 
Candidates joining Wipro should have a strong assurance and willingness to contribute to the company's success.
• Candidates should demonstrate a clear understanding of Wipro's values and goals.

• They should be enthusiastic about the opportunity to work at Wipro and contribute to its growth.

• Candidates should be committed to their role and show a willingness to learn and adapt to new challenges.

• They should have a positive at...read more
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Q4. Previous employment history and reasons of switching the jobs
Ans. 
I have worked at multiple companies, gaining valuable experience and skills in Java development.
• Worked at Company A for 2 years, gained experience in developing web applications using Java Spring framework

• Switched to Company B for better growth opportunities and exposure to new technologies like microservices architecture

• Currently looking for a new challenge in a Senior Java Developer role to further enhance my skills
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Q5. Compensation negotiations
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Q1. Internal working of hashmap?
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to retrieve values.
• HashMap uses an array of buckets to store key-value pairs

• Each bucket contains a linked list of entries

• Hashing is used to determine the index of the bucket where the entry should be stored

• If multiple entries have the same hash code, they are stored in the same bucket as a linked list

• HashMap allows null keys and values

• HashMap is n...read more
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Q2. How to create immutable classes?
Ans. 
Immutable classes cannot be modified after creation. They ensure thread safety and prevent bugs.
• Make the class final so it cannot be extended

• Make all fields private and final

• Do not provide any setters, only getters

• If a field is mutable, return a copy of it in the getter

• Consider using a builder pattern for complex objects
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Q3. How to create singleton class ?
Ans. 
Singleton class is a class that can only have one instance at a time.
• Create a private constructor to prevent instantiation from outside the class.

• Create a private static instance of the class.

• Create a public static method to get the instance of the class.

• Ensure thread safety by using synchronized keyword or static initializer.

• Example: public class Singleton { private static Singleton instance = null; private Singleton(...read more
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Q4. We have a employee class having empId, name and salary fields. I have around 1000 employee objects, I want to sort them according employee name is descending order?
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Q5. Basic OOPS related questions?
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Q6. Difference between List and Set? which one to prefer in which requirements and why ?
Ans. 
List allows duplicates and maintains insertion order, Set doesn't allow duplicates and doesn't maintain order.
• Use List when duplicates are allowed and order is important

• Use Set when duplicates are not allowed and order is not important

• List examples: ArrayList, LinkedList

• Set examples: HashSet, TreeSet
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Q7. Spring Boot basic questions?
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Q8. How to implement Spring security with JWT token?
Ans. 
Implementing Spring security with JWT token involves configuring security filters and authentication providers.
• Add dependencies for Spring Security and JWT

• Configure security filters to validate JWT tokens

• Implement authentication provider to authenticate users

• Generate and sign JWT tokens for successful authentication

• Example: https://www.baeldung.com/spring-security-jwt
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