Top 20+ Java Full Stack Developer Interview Questions With Answers

Java Full Stack Developer Interview Questions – The job market for Java Full Stack Developers is very competitive. Did you know? According to a report from LinkedIn, the need for full-stack developers trained in Java full-stack courses has been rising by 35% every year since 2015.

To build a successful career in this field, you need two things – 

• Finding the right job opportunity 
• And confidently cracking your interview

We’ve got you covered on both fronts. 

• Easily find job opportunities at Hirist 
• And use our guide for interview preparation

We’ve gathered the top 20+ Java Full Stack Developer interview questions with answers to help you prepare and increase your chances of success.

So, let’s begin!

Java Full Stack Developer Interview Questions for Freshers

Here are some commonly asked basic interview questions for Java Full Stack Developer and their answers.

1. What is Java?

Java is a high-level programming language used to create applications for various platforms. It is known for its portability, scalability, and robustness.

2. Why do you want to be a Java Full Stack Developer?

I enjoy working with both front-end and back-end technologies. Being a Java Full Stack Developer allows me to use my skills to build complete applications, from user interfaces to server logic. Java’s versatility and the ability to work on different parts of a project make it an exciting field for me.

3. Explain the difference between JDK, JRE, and JVM.

JDK (Java Development Kit) is a software development kit used to develop Java applications. JRE (Java Runtime Environment) provides libraries and other resources to run Java applications. JVM (Java Virtual Machine) is a part of JRE that runs Java bytecode on any platform.

4. What is a RESTful API?

A RESTful API is an API that follows the principles of REST (Representational State Transfer). It uses standard HTTP methods like GET, POST, PUT, and DELETE to perform operations on data.

5. What are the key features of Spring Framework?

Spring Framework is known for its comprehensive infrastructure support for developing Java applications. Key features include Inversion of Control (IoC), Aspect-Oriented Programming (AOP), transaction management, and MVC architecture.

Also Read - Top 25 Spring Boot Microservices Interview Questions with Answers

6. What is the purpose of a version control system like Git?

A version control system like Git helps manage changes to source code over time. It allows multiple developers to work on the same project without conflicts, keeps track of changes, and can revert to previous versions if needed.

7. What is a responsive web design?

Responsive web design ensures that a website looks good and works well on various devices, from desktops to smartphones. It uses flexible layouts, images, and CSS media queries to adapt to different screen sizes.

Java Full Stack Developer Interview Questions for Experienced

Here are some important Java Full Stack Developer interview questions and answers for experienced.

8. Can you explain the Model-View-Controller (MVC) architecture?

MVC is a design pattern used to separate an application into three main components: Model, View, and Controller. The Model represents the data and business logic, the View displays the data, and the Controller handles the input and updates the Model and View accordingly. 

9. What is Hibernate, and why is it used?

Hibernate is an Object-Relational Mapping (ORM) framework for Java. It simplifies database interactions by allowing developers to use Java objects to represent database tables. 

Hibernate handles the conversion between Java objects and database tables, reducing the need for complex SQL queries and making database operations more intuitive and less error-prone.

10. How do you ensure the security of a web application?

I secure web applications by implementing authentication, using HTTPS, validating inputs, regularly updating libraries, and conducting security audits and tests to identify and fix vulnerabilities.

11. What is Continuous Integration/Continuous Deployment (CI/CD), and why is it important?

CI/CD automates software development, testing, and deployment processes. CI merges code changes and runs tests, while CD automates code releases. It enhances code quality, speeds up deployment, and ensures reliability.

12. What experience do you have with cloud services like AWS or Azure?

I have experience using cloud services like AWS and Azure for various tasks, such as deploying web applications, setting up databases, and managing storage. 

I’ve used AWS EC2 for hosting applications, S3 for storage, and RDS for database management. Using these services allows for scalable, reliable, and cost-effective solutions for hosting and managing applications.

13. Can you tell me about a challenging project you worked on and how you overcame the challenges?

In a previous project, we had to integrate a complex third-party API with our application. The API documentation was lacking, and we faced several bugs. I tackled this by thoroughly reading the available documentation, reaching out to the API support team, and debugging it step-by-step. 

14. How do you manage dependencies in a Java project?

This is one of the most common Java Full Stack Developer interview questions for 5 years experience candidates. 

I use Maven or Gradle to manage dependencies, handle versioning, automate builds, and ensure consistent project setups. They fetch required libraries, manage versions, and streamline development workflows.

Also Read - Job Experience Letter Format and Samples

Advanced Java FSD Interview Questions

A list of advanced Java Full Stack Developer interview questions and their answers. 

15. What is the difference between REST and SOAP web services?

REST uses standard HTTP methods and is lightweight, whereas SOAP is a protocol with strict standards and uses XML. REST is simpler and faster, while SOAP is more secure.

16. How does asynchronous programming help in web development?

Asynchronous programming allows tasks to run in the background without blocking the main thread. This improves application performance and responsiveness, especially for I/O operations.

17. What is the use of Docker in development?

Docker allows applications to run in isolated containers, ensuring consistency across different environments. It simplifies deployment, scales easily, and helps manage dependencies efficiently.

18. What is CORS, and why is it important?

CORS (Cross-Origin Resource Sharing) is a security feature that controls how resources are requested from a different domain. It prevents unauthorized access and ensures secure data sharing.

Also Read - Top 25+ Frontend Interview Questions and Answers

Java Full Stack MCQ Questions

Here are some common MCQ interview questions for Java Full Stack Developer.

19. Which design pattern is commonly used in microservices architecture to ensure fault tolerance and resilience?

A) Singleton

B) Observer

C) Circuit Breaker

D) Factory Method

Answer: C) Circuit Breaker

20. Which of the following is true about the HashMap class in Java?

A) It allows duplicate keys

B) It maintains the insertion order of its elements

C) It is synchronized by default

D) It allows null values and, at most, one null key

Answer: D) It allows null values and, at most, one null key

Also Read - Top 20+ HashMap Interview Questions With Answers

21. Which of the following HTTP methods is idempotent?

A) GET

B) POST

C) PUT

D) DELETE

Answer: A) GET

22. Which tool is commonly used for containerization of applications in the Java ecosystem?

A) Docker

B) Kubernetes

C) Vagrant

D) Ansible

Answer: A) Docker

23. What does JVM stand for in the context of Java programming?

A) Java Virtual Machine

B) Java Version Manager

C) Java Validation Module

D) Java Virtual Model

Answer: A) Java Virtual Machine

Wrapping Up

These are the top 20+ Java Full Stack Developer interview questions with answers, covering key concepts from basic to advanced levels. Learning these questions will help you prepare for your interview and increase your chances of success. Interested in full stack job opportunities? Visit Hirist! It is an online job portal dedicated to IT roles. Simply install the app on your phone or browse on the web to find your dream jobs as a Java Full Stack Developer.