OSB India Java Developer Interview Questions and Answers

Q1. Transactions in spring
Ans. 
Transactions in Spring framework help manage database transactions in a consistent and reliable manner.
• Spring provides support for declarative transaction management using @Transactional annotation

• Transactions can be managed programmatically using TransactionTemplate

• Spring supports both programmatic and declarative transaction management

• Transactions ensure ACID properties (Atomicity, Consistency, Isolation, Durability)
Answered by AI
Add your answer
Q2. Static va virtual
Add your answer

Oops concepts, core java question

Recursion, palindrom numbers, basic dsa question

MCQ would be held in online mode

Q1. Explain solid principal
Ans. 
SOLID is a set of principles for object-oriented programming to make software more maintainable, flexible and understandable.
• S - Single Responsibility Principle

• O - Open/Closed Principle

• L - Liskov Substitution Principle

• I - Interface Segregation Principle

• D - Dependency Inversion Principle
Answered by AI
Add your answer
Q2. Explain CURD operation
Ans. 
CURD stands for Create, Update, Read, and Delete. It is a set of basic operations used in database management.
• Create - inserting new data into the database

• Update - modifying existing data in the database

• Read - retrieving data from the database

• Delete - removing data from the database
Answered by AI
Add your answer
Q3. What is marker interface
Ans. 
Marker interface is an interface with no methods, used to mark a class as having a certain property or behavior.
• Marker interfaces are used to provide metadata to the JVM or other tools.

• Examples of marker interfaces in Java include Serializable, Cloneable, and Remote.

• Marker interfaces can be used to enforce design patterns or conventions.

• Marker interfaces can also be used to indicate that a class should be processed in
Answered by AI
Add your answer
Q4. Different between array and linklist
Ans. 
Array is a fixed-size data structure while LinkedList is a dynamic data structure.
• Arrays have a fixed size while LinkedLists can grow dynamically.

• Arrays are faster for accessing elements while LinkedLists are faster for inserting and deleting elements.

• Arrays store elements in contiguous memory locations while LinkedLists store elements in nodes with pointers to the next node.

• Arrays can be multi-dimensional while Linked
Answered by AI
Add your answer
Q5. Coding on Hashmap in java
Add your answer

Java coding and apptitude questions

Q1. Tell me about project
Ans. 
I worked on a project to develop a web application for an e-commerce company.
• Developed the front-end using HTML, CSS, and JavaScript

• Implemented the back-end using Java and Spring framework

• Integrated payment gateway and order management system

• Optimized database queries for improved performance
Answered by AI
Add your answer
Q2. Tell about previous company
Ans. 
I worked at XYZ Company as a Java Developer.
• Developed and maintained Java applications for XYZ Company.

• Collaborated with a team of developers to implement new features and fix bugs.

• Used Java frameworks like Spring and Hibernate to build robust and scalable applications.

• Worked on database design and optimization using SQL.

• Participated in code reviews and provided feedback to improve code quality.

• Implemented unit tests t...read more
Answered by AI
Add your answer

Q1. What is the difference between a static function and a static variable?
Add your answer
Q2. What is the synchronization technique?
Add your answer

Add an element to a linked list.

Aptitude test on engineering subjects

Writing projects in c

It continues for 15 mins