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Infosys Java Java developer Interview Questions | AskTaaza

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Infosys Interview — Java (Java developer)

November 12, 2025

Company: Infosys
Role: Java developer
Experience: 3-4 years
Round: Other

JavaOther

Questions Asked

10 questions

1.1.Explain the difference between JDK, JRE, and JVM. How are they related?
2.2.What is the difference between String, StringBuilder, and StringBuffer? When would you use each?
3.3.How do you implement custom validation in Spring Boot? Explain with an example.
4.4.Write a program to check if a string is a palindrome without using built-in reverse functions.
5.5.What is the difference between @RestController and @Controller in Spring?
6.6.Explain the Java Memory Model. 7.What are heap and stack? How does garbage collection work?
7.8.How do you connect to a MySQL database in Spring Boot? Explain the configuration.
8.9.Design a library management system. Include entities, relationships, and key operations.
9.10.What are the different types of joins in SQL? Explain with examples.
10.

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1.Explain the difference between JDK, JRE, and JVM. How are they related? 2.What is the difference between String, StringBuilder, and StringBuffer? When would you use each? 3.How do you implement custom validation in Spring Boot? Explain with an example. 4.Write a program to check if a string is a palindrome without using built-in reverse functions. 5.What is the difference between @RestController and @Controller in Spring? 6.Explain the Java Memory Model. 7.What are heap and stack? How does garbage collection work? 8.How do you connect to a MySQL database in Spring Boot? Explain the configuration. 9.Design a library management system. Include entities, relationships, and key operations. 10.What are the different types of joins in SQL? Explain with examples. 11.Explain your experience with version control (Git). How do you handle merge conflicts?
Explain the difference between HashMap and ConcurrentHashMap. When would you use each? How do you handle transactions in Spring Boot? Explain the @Transactional annotation. Design a REST API for an e-commerce cart system. Include endpoints and explain authentication. What is the difference between fail-fast and fail-safe iterators in Java Collections? Write a SQL query to find the second highest salary from an Employee table. Explain microservices architecture and how you would handle inter-service communication. How do you implement exception handling in Spring Boot? Give examples of custom exceptions. Describe a situation where you optimized database queries. What approach did you take? What are the SOLID principles? Explain with real-world examples. How would you implement authentication and authorization in a Spring Boot application?

Also Asked In

Submitted anonymously · Interview on November 12, 2025 · 3-4 years experience

11.Explain your experience with version control (Git). How do you handle merge conflicts?

What are the important features of Java 17? What is JWT? How does JWT work in a real-time application? How is authentication handled in microservices? What is microservices architecture? How do microservices communicate with each other? How does Kafka integrate with a Spring Boot application? Difference between synchronous and asynchronous communication How do you handle data consistency across microservices? What happens if one service goes down? What are the advantages and disadvantages of stored procedures? What are Azure Functions? Why do we use serverless architecture? Write a program to print non-repeated characters in a string Why do we use stored procedures? How do you handle failures in Kafka-based systems?