Hyundai Java Developer Interview Experience | 3+ Years Java & Spring Boot Questions

Project & Introduction Questions

1. Introduce yourself.
2. Explain your current project architecture.
3. What modules have you worked on?
4. What is your role in the backend team?
5. Explain your experience with banking applications.
6. Explain your experience with microservices.
7. Which Java version are you currently using?
8. Have you worked with Java 8 and Java 17?
9. Which Spring Boot version are you using?

Spring & Spring Boot Interview Questions

1. What is the difference between Spring and Spring Boot?
2. What is auto-configuration in Spring Boot?
3. What are starter dependencies in Spring Boot?
4. Why is Spring Boot preferred for microservices?
5. What configurations are required in Spring Framework?
6. How does Spring Boot reduce boilerplate code?
7. What is the difference between Spring project and Spring Boot project?
8. How do you configure database connectivity in Spring Boot?
9. What is dependency management in Maven?

Java Streams Interview Questions

1. What are Java Streams?
2. What is the difference between intermediate and terminal operations in Streams?
3. Explain filter() in Streams.
4. Explain map() in Streams.
5. Explain collect() method.
6. How do you find an element in a List using Streams?
7. How do you find minimum value using Streams?
8. How do you find maximum value using Streams?
9. What is mapToInt()?
10. Why do we convert object streams into primitive streams?
11. Difference between Stream of Objects and Primitive Streams?
12. Explain findFirst() method.
13. Explain Optional in Java Streams.

Core Java Interview Questions

1. What is String Pool in Java?
2. Difference between Heap Memory and String Pool?
3. Difference between == and .equals()?
4. What happens when we create String using new String()?
5. What is String literal?
6. Explain immutable objects in Java.
7. What is object comparison in Java?
8. Why should we avoid == with wrapper objects?

File Handling Interview Questions

1. How do you read a file in Java?
2. How do you search text inside a file?
3. Explain Java File Handling.
4. Difference between FileReader and BufferedReader?
5. What is NIO in Java?
6. How do you read file content using Files.readString()?
7. How do you check whether a string exists inside a text file?

DSA & Algorithm Questions

1. What is Binary Search?
2. What is the time complexity of Binary Search?
3. Why does Binary Search require sorted arrays?
4. How does Binary Search work internally?
5. Explain left, right and middle pointers in Binary Search.
6. Implement Binary Search in Java.
7. Difference between Linear Search and Binary Search.

SQL Interview Questions

1. What is JOIN in SQL?
2. Difference between INNER JOIN and LEFT JOIN?
3. What is GROUP BY?
4. How do you count records in SQL?
5. Write SQL query to count orders placed by each customer.
6. What is foreign key relationship?
7. Explain aggregate functions in SQL.
8. How do you join two tables using customer_id?

Hibernate & JPA Interview Questions

1. What is JPA?
2. What is Hibernate?
3. Difference between JPA and Hibernate?
4. How do you connect Spring Boot with MSSQL?
5. What is ORM?
6. What is database URL configuration?
7. How do you configure datasource in Spring Boot?
8. What dependencies are required for database connection?
9. Explain ORM framework in Java.

Practical Coding Questions Asked

1. Find a number from List using Streams.
2. Find minimum number using Streams.
3. Find maximum number using Streams.
4. Read a file and search a string.
5. Implement Binary Search.
6. Write SQL query using JOIN and GROUP BY.
7. Compare Strings in Java.
8. Explain String Pool with example.

Conclusion

These are real Java Developer interview questions asked for a 3+ years experienced candidate focusing on:

• Java
• Spring Boot
• Streams API
• SQL
• DSA
• File Handling
• Hibernate/JPA
• Microservices

These questions are highly useful for backend developer interview preparation.