Senior Java Fullstack Developer

Senior Java Fullstack Developer Interview Questions and Answers

Updated 5 Sep 2024

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Q1. where you used microservice in your last project?

Ans.

I used microservices in my last project to break down a monolithic application into smaller, independent services.

Implemented microservices architecture using Spring Boot and Docker
Separated functionalities like user management, payment processing, and inventory management into individual services
Used RESTful APIs for communication between microservices
Deployed microservices on Kubernetes for scalability and fault tolerance

Ans.

Spring is a framework for building Java applications, while Spring Boot is a tool for quickly creating standalone Spring-based applications.

Spring is a comprehensive framework for building Java applications, providing support for dependency injection, aspect-oriented programming, and more.
Spring Boot is an opinionated tool that simplifies the setup and configuration of Spring applications, allowing for quick development of standalone applications.
Spring Boot includes embedded...read more

Ans.

Database connection can be established using JDBC or ORM frameworks like Hibernate.

Use JDBC to establish a connection by loading the driver, creating a connection object, and executing SQL queries.
Use ORM frameworks like Hibernate to map Java objects to database tables and handle database operations through object-oriented programming.
Ensure proper configuration of database connection parameters such as URL, username, and password.
Handle exceptions and close the connection pr...read more

Ans.

Spring is a popular Java framework used for building enterprise applications.

Spring provides comprehensive infrastructure support for developing Java applications.
It simplifies the development of Java applications by providing ready-to-use components.
Spring enables developers to focus on business logic rather than boilerplate code.
Examples: Spring Boot, Spring MVC, Spring Security.

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Ans.

Spring Boot microservices are small, independent, loosely coupled services built using the Spring Boot framework.

Microservices are small, independent services that work together to form a larger application.
Spring Boot is a framework that simplifies the development of Java-based applications.
Spring Boot microservices are designed to be easily deployable and scalable.
Each microservice typically handles a specific business function or domain.
Communication between microservices ...read more

Ans.

List is an ordered collection that allows duplicate elements, while Set is an unordered collection that does not allow duplicates.

List maintains the insertion order of elements, while Set does not guarantee any specific order.
List allows duplicate elements, while Set does not allow duplicates.
Examples: List - ArrayList, LinkedList. Set - HashSet, TreeSet.

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Ans.

Comparator is used to compare objects externally, while Comparable is used to compare objects internally.

Comparator is implemented in a separate class, while Comparable is implemented in the same class as the object being compared.
Comparator allows for multiple ways of sorting objects, while Comparable only allows for one way.
Example: Sorting a list of custom objects by a specific attribute can be done using Comparator, while sorting a list of Strings can be done using Compar...read more