Epicminds Information Technology Java Developer Interview Questions and Answers

Q1. Internal working of HashMap
Add your answer
Q2. Features of java8
Add your answer
Q3. Use of synchronized keyword
Add your answer
Q4. Difference between failsafe and fail fast and also its implementation
Add your answer
Q5. Coding question : sort an array, use of streams to find names from employee object whose salary is greater than 50000
Add your answer
Q6. Difference between concurrent and generic collection
Add your answer
Q7. What is string pool. What is string literal?
Add your answer
Q8. Security measures used in your project
Add your answer
Q9. What is difference between rest and soap
Add your answer
Q10. What do u mean by REST state
Add your answer
Q11. What is serialization? What is the way to stop serialization?
Add your answer

Q1. Difference between failsafe and faifast
Add your answer
Q2. Difference between concurrent and generic collection
Add your answer
Q3. Security measures used in current project
Add your answer
Q4. Why you are leaving your current organization and follow up questions on that
Add your answer

Q1. Coding questions on java8
Add your answer
Q2. Regarding microservices
Add your answer
Q3. Internal working of circuit breaker
Ans. 
Circuit breaker is a design pattern used in software development to prevent system failures by temporarily stopping requests to a failing service.
• Circuit breaker monitors the number of failures and opens when a threshold is reached.

• When the circuit is open, requests are not sent to the failing service, preventing further failures.

• After a specified time, the circuit breaker closes and allows requests to be sent again.

• Ex...read more
Answered by AI
Add your answer
Q4. Frequency of occurrence of words
Ans. 
Frequency of occurrence of words in a given text can be calculated by counting each word and storing it in a data structure.
• Split the text into words using whitespace as delimiter

• Create a map to store word frequencies

• Iterate through the words and update the frequency count in the map

• Return the map with word frequencies
Answered by AI
Add your answer
Q5. How spring boot will work two databases
Ans. 
Spring Boot can work with two databases by configuring multiple data sources and using @Primary annotation.
• Configure multiple data sources in application.properties or application.yml

• Use @Primary annotation to specify the primary data source

• Use @Qualifier annotation to specify the secondary data source

• Example: @Configuration @EnableTransactionManagement public class DatabaseConfig { @Primary @Bean(name = "primaryDataSo...read more
Answered by AI
Add your answer

Q1. Difference between hashmap and hash table
Ans. 
HashMap is non-synchronized and allows null values, while HashTable is synchronized and does not allow null values.
• HashMap is non-synchronized, meaning it is not thread-safe, while HashTable is synchronized and thread-safe.

• HashMap allows null values for both keys and values, while HashTable does not allow null keys or values.

• HashMap is generally preferred for non-thread-safe applications, while HashTable is used in mul
Answered by AI
Add your answer
Q2. Static block related questions
Add your answer
Q3. Arraylist and linkedlist question
Add your answer

Onlin test consist pf easy numerical questions

Easy questions not so difficult

Q1. Java oops concept
Add your answer
Q2. Basic sprophramming questions
Add your answer
Q3. Networking firewall cisco
Add your answer

Q1. Personal questions
Add your answer
Q2. Whetehr to willing to work in any locations
Ans. 
Yes, I am willing to work in any location for the right opportunity.
• I am open to relocating for the right job opportunity

• I am flexible and adaptable to new environments

• I believe working in different locations can provide valuable experiences and growth opportunities
Answered by AI
Add your answer

Q1. Features of java 8
Ans. 
Java 8 introduced several new features including lambda expressions, functional interfaces, streams, and default methods.
• Lambda expressions allow for more concise code and enable functional programming.

• Functional interfaces are interfaces with a single abstract method, used for lambda expressions.

• Streams provide a way to work with sequences of elements and support parallel processing.

• Default methods allow interfaces to...read more
Answered by AI
Add your answer
Q2. Questions from steam api
Add your answer
Q3. Spring life cycle flow
Add your answer

Q1. Current work structure
Ans. 
Currently working as a Java Developer at XYZ Company, responsible for developing and maintaining Java applications.
• Developing and maintaining Java applications

• Collaborating with team members on projects

• Participating in code reviews and debugging

• Implementing new features and enhancements

• Troubleshooting and resolving technical issues
Answered by AI
Add your answer
Q2. Other technalogies I am using in my compnay
Add your answer

Q1. Spring boot architechture
Add your answer
Q2. Streams coding questions
Add your answer
Q3. Second highest salary sql
Ans. 
To find the second highest salary in SQL, use the 'SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees);'
• Use the MAX() function to find the highest salary in the table

• Use a subquery to find the maximum salary that is less than the highest salary

• Combine both queries to get the second highest salary
Answered by AI
Add your answer
Q4. Solid priciples
Add your answer
Q5. Acid properties
Ans. 
ACID properties are a set of properties that guarantee database transactions are processed reliably.
• ACID stands for Atomicity, Consistency, Isolation, Durability

• Atomicity ensures that all operations in a transaction are completed successfully or none at all

• Consistency ensures that the database remains in a consistent state before and after the transaction

• Isolation ensures that transactions are executed independently of...read more
Answered by AI
Add your answer

First round is quit easy

2 coding question based on dsa

Q1. Explain different phases of sdlc
Ans. 
SDLC stands for Software Development Life Cycle, which consists of different phases from planning to maintenance.
• 1. Planning phase involves defining project scope, requirements, and creating a project plan.

• 2. Analysis phase focuses on gathering and analyzing requirements to create a detailed system design.

• 3. Design phase involves creating a high-level design, detailed design, and architecture for the software.

• 4. Implem...read more
Answered by AI
Add your answer
Q2. 4 paillers of datastructure.
Ans. 
The 4 pillars of data structure are arrays, linked lists, stacks, and queues.
• Arrays: Data structure that stores a collection of elements with a fixed size.

• Linked Lists: Data structure where each element points to the next element in the sequence.

• Stacks: Data structure that follows the Last In First Out (LIFO) principle.

• Queues: Data structure that follows the First In First Out (FIFO) principle.
Answered by AI
Add your answer

Q1. Core Java, multithreading and foncurrency
Add your answer
Q2. Springboot , app
Add your answer
Q3. Working of hashset

Ans. 

HashSet is a collection that does not allow duplicate elements and does not guarantee the order of elements.

• HashSet uses a hash table for storage.

• Elements are stored based on their hash code.

• Adding an element to a HashSet returns false if the element is already present.

• Example: HashSet set = new HashSet<>(); set.add("apple");

Add your answer