Java: Interview Questions, Roadmap & Practice
Learn core and advanced Java, collections, multithreading, JDBC, Hibernate and Spring Boot to become a Java backend developer
About Java
Java is a mature, object oriented language that runs on the JVM and powers banking platforms, ecommerce backends, payment systems, Android apps and large enterprise software. In India it is one of the most hired skills, used by IT services firms, global capability centres, banks, fintechs and product companies to build scalable REST APIs and microservices. This course covers core Java and OOP, strings and exceptions, the Collections Framework, multithreading and virtual threads, Java 8 to 21 features, JDBC with Hibernate and JPA, and Spring Boot microservices. It leads to roles such as Java developer, backend engineer, Spring Boot developer and full stack Java developer.
- Duration
- 16 weeks
- Level
- Beginner → Advanced
- Tools
- Java 21, IntelliJ IDEA, Maven, Spring Boot, Hibernate, MySQL
All interview questions
200 questions with answers
View questionsCompany-wise
20 companies
View questionsExperience-wise
Freshers to 10+ years
View questionsRole-wise
6 job roles
View questionsCity-wise
20 cities
View questionsTopic sheets
8 topics
Open sheetsRoadmap
6 phases · 16 weeks
Open roadmapTop 50 most asked
Start here
View questionsMock interview
20 questions · 50 minutes
Start mockInterview rounds
Online test to managerial
View questionsLast-minute revision
30 quick notes
Revise nowRecorded course
Learn at your own pace
See course detailsTopics covered
Frequently asked questions
What jobs can I get after learning Java?
Java leads to roles such as Java developer, backend developer, Spring Boot developer, full stack Java developer and later senior engineer or solution architect. IT services companies hire many Java freshers every year, and banks, fintechs, ecommerce firms and global capability centres hire experienced Java engineers for backend and microservice work. Java skills also help in automation testing with Selenium and in Android development.
Who can join a Java course?
Anyone who wants a software development career can learn Java, including BTech, BCA, MCA, BSc and diploma students, fresh graduates and working professionals switching from support, testing or non-IT roles. No prior coding experience is required, because the course starts from basics like variables and loops. Basic computer skills and logical thinking are enough, and regular practice matters more than your degree.
How long does it take to learn Java for a job?
With two to three hours of daily study, most learners become comfortable with core Java in about two months and job ready with Spring Boot, JPA and projects in about four months. The 16 week plan in this course follows that path. Interview readiness also needs DSA practice in Java, so plan a few extra weeks of coding problems alongside the course.
Is Java still in demand in 2026?
Yes. Java remains one of the most used backend languages in India and worldwide, especially in banking, insurance, ecommerce, payments and large enterprise systems. Regular LTS releases like Java 21 and Java 25, virtual threads and Spring Boot 3 keep it modern. Job portals consistently list Java and Spring Boot among the most requested skills for backend developers.
Which Java certification is useful?
The Oracle Certified Professional Java SE Developer certification, for Java 17 or Java 21, is the most recognised Java credential and proves strong core language knowledge. Spring Professional certification from Broadcom adds value for Spring roles. Certificates help with shortlisting, but recruiters still give more weight to projects on GitHub, problem solving ability and how well you explain your work in interviews.
Should I learn Java or Python first?
Choose based on your goal. Java is a strong first language for backend development, enterprise jobs, Android and campus placements, because many coding rounds and services companies use it. Python is better for data science, machine learning and scripting. Java's strict typing and OOP build strong fundamentals, and learning Python later becomes easy once you know Java well.