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Full Stack Java Developer Interview Questions

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1,047 full stack java developer interview questions shared by candidates

They mainly focused on Core Java concepts such as OOP principles, collections, and basic exception handling. They also asked me to explain the projects mentioned in my resume and questioned what I learned during the Digital Nurture 4.0 program and how I implemented it practically.
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Java Full Stack Developer

Interviewed at Cognizant

3.6★
Jan 20, 2026

They mainly focused on Core Java concepts such as OOP principles, collections, and basic exception handling. They also asked me to explain the projects mentioned in my resume and questioned what I learned during the Digital Nurture 4.0 program and how I implemented it practically.

1.What is spring MVC 2.Which Spring boot Annotations you used in your project 3.What are spring boot Profiles 4. Explain Java8 Features. 5. what is Functional Interface? Why it is introduced when we have an Interface? 6. Collections and which are all the collections you used in your project. 7. Write a java program to demonstrate lambda expression. 8. what is spring boot actuator? 9. How do two microservices communicate with each other? 10. What is kafka? 11. Modules in angular? 12. Why we use Ng Serve do ? 13. What are components in angular? 14. Collections vs Stream
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Full Stack Java Developer

Interviewed at Tech Mahindra

3.4★
Mar 25, 2025

1.What is spring MVC 2.Which Spring boot Annotations you used in your project 3.What are spring boot Profiles 4. Explain Java8 Features. 5. what is Functional Interface? Why it is introduced when we have an Interface? 6. Collections and which are all the collections you used in your project. 7. Write a java program to demonstrate lambda expression. 8. what is spring boot actuator? 9. How do two microservices communicate with each other? 10. What is kafka? 11. Modules in angular? 12. Why we use Ng Serve do ? 13. What are components in angular? 14. Collections vs Stream

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