Duronto Technologies interview experience Real time questions & tips from candidates to crack your interview
Java Developer
Duronto Technologies
1 rounds | 1 Coding
problems
Rejected
Interview preparation journey
Journey
I focused on strengthening Core Java (OOPs, collections, exception handling, multithreading, Java 8 features) and advanced frameworks like Spring and Hibernate. I practiced building REST APIs, working with databases (MySQL/Oracle), and solving DSA problems regularly. Through projects and mock assignments, I gained hands-on experience in developing scalable applications, preparing me to contribute effectively as a Java Application Developer.
Preparation
Topics: Java, Springboot
Application process
Where: Coding Ninjas Placement Cell
Eligibility: Bachelor's degree in CS/IT
Interview rounds
01
Round
Easy
Online Coding Interview
Duration
Interview date9 Sep 2025
Coding problem1
1. Java, Spring Boot, Multithreading, and SQL
- What are abstract classes in Java, and when would you use them?
- Explain the difference between final, finally, and finalize keywords in Java.
- How does exception handling work in Java? What happens if an exception is thrown inside a finally block?
- What is a functional interface in Java?
- Can we create a constructor in an abstract class?
- How many ways can we create threads in Java?
- What is the purpose of synchronized in multithreading, and how is it used?
- How is thread pool management implemented in Java multithreading?
- Explain the internal working of HashMap in Java.
- What is the difference between Comparable and Comparator in Java?
- What is the Stream API in Java?
- What are terminal and intermediate methods in Stream API?
- Given an ArrayList, how would you count the frequency of each integer using Stream API?
- Given an ArrayList, how would you sort it and store the result in another ArrayList using Stream API?
- Explain commonly used Spring Boot annotations and their purpose.
- What is fetch type in JPA? Explain EAGER vs LAZY loading.
- In entity relationships, how can we avoid creating a third table in one-to-many or many-to-one relationships?
- What is the purpose of @Qualifier annotation in Spring?
- What is the purpose of @Primary annotation in Spring?
- Explain the difference between DELETE, TRUNCATE, and DROP in databases.
- How does GROUP BY work in SQL? Can you give an example query?
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Skill covered: Programming
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