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Junior Java Developer Interview Questions

"Junior developers are often responsible for writing the more monotonous and simple code required by senior members of the development team. Because of this, interviews will be designed to test your knowledge of the fundamentals of Java so be prepared to answer technical questions that you likely came across in college. Data structures and algorithms will be heavily emphasised. A bachelor's degree or equivalent work experience is required. "

3,799 junior java developer interview questions shared by candidates

1. Explain the difference between StringBuilder and StringBuffer in Java. 2. What is an Actuator in the context of Spring Boot? 3. Define Dependency Injection and explain its types. 4. How and where is Polymorphism implemented in Java? 5. What is Indexing in PostgreSQL, and how does it work? 6. Differentiate between JWT (JSON Web Token) and Spring Security. 7. Describe your roles and responsibilities as a Java Developer. 8. What are the differences between JavaScript, AJAX, and jQuery? 9. What is a Partition in a database, and why is it used? 10. On a scale of 1 to 5, how would you rate PostgreSQL and why? 11. What are the latest versions of Java and Spring Boot? 12. Explain the difference between a Function and a Procedure in PostgreSQL. 13. How does @RequestMapping differ from @GetMapping in Spring? 14. What does the static keyword mean in the public static void main(String[] args) method?
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Junior Java Developer

Interviewed at VASYERP

3.8★
Jan 22, 2025

1. Explain the difference between StringBuilder and StringBuffer in Java. 2. What is an Actuator in the context of Spring Boot? 3. Define Dependency Injection and explain its types. 4. How and where is Polymorphism implemented in Java? 5. What is Indexing in PostgreSQL, and how does it work? 6. Differentiate between JWT (JSON Web Token) and Spring Security. 7. Describe your roles and responsibilities as a Java Developer. 8. What are the differences between JavaScript, AJAX, and jQuery? 9. What is a Partition in a database, and why is it used? 10. On a scale of 1 to 5, how would you rate PostgreSQL and why? 11. What are the latest versions of Java and Spring Boot? 12. Explain the difference between a Function and a Procedure in PostgreSQL. 13. How does @RequestMapping differ from @GetMapping in Spring? 14. What does the static keyword mean in the public static void main(String[] args) method?

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