Senior Java Fullstack Developer Interview Questions and Answers

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

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

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

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.

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.

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