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Java In-Depth: Become a Complete Java Engineer! [2026] (Udemy.com)

Java Programming Bootcamp with Spring Boot, Best Practices, Design Rules & Spring Boot Project — Updated for Java 25

4.4
25,541 reviews

Created by: Dheeru Mundluru

Last updated August 2026

Our take

Based on the ratings of 25,541 students, a sample of their written reviews and the syllabus, as the course stood in August 2026. No course pays to be reviewed.

Dheeru Mundluru's course is a long, slow build of Java from the ground up. It runs about 90 hours across 470 lectures, starting with how Java compiles and runs, then moving through classes, OOP, JVM internals, exceptions, I/O, collections and generics. The description says Spring Boot sections and a project were added later, and the last update was in August 2026. It is labeled for all levels, but it is built for people willing to commit months, not a weekend.

Reviewers like the depth and the production habits. One says the instructor goes past language features into best practices, and others call the explanations detailed, with a clear accent and audio. The Thrillio project gets a nod as a fun way to apply the theory. The complaints are consistent too. Low-star reviewers say simple ideas are explained at length, the slides look unprofessional, some exercises date from 2015, and the multithreading section leans on definitions. One says the English is hard to follow, and another calls it too basic.

Of 25,541 ratings, 13,057 are five stars and 9,204 are four, for a 4.4 average, and only 751 are below three stars. Value here depends on patience. Anyone who wants a fast route to Spring Boot will find it behind many hours of core Java. Someone who wants a solid base, and to learn why professional code looks the way it does, gets that. It suits beginners who like things explained twice, and it is a poor fit for people in a hurry.

Best forBeginners or rusty Java developers who want slow, thorough coverage of OOP and production habits.
Skip it ifYou already know Java and want a quick Spring Boot course, or you get impatient with long explanations.

Pros

  • Goes past syntax into production-grade best practices and coding conventions
  • Several reviewers call the explanations detailed, with a clear accent and audio
  • Thrillio project and 21 coding exercises give hands-on practice
  • Kept current: Java 25, virtual threads and Spring Boot were added recently

Cons

  • Simple ideas are explained at length, and one reviewer found the intro needlessly long
  • One reviewer calls the slides unprofessional and says the exercises are from 2015 despite a 2026 title
  • Multithreading is called definition-heavy, and one reviewer found the English hard to follow
I enjoy the depth of instruction the instructor brings to the various topics. I look forward to continuing to learn more.
Keenan Lynch, a student

Labeled all levels. Beginners fit if they can commit to a long haul, but experienced developers may find the early hours slow.

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What you will learn

  • Industry-oriented, comprehensive 90-hour bootcamp updated to Java 25 to help you master Core & Advanced Java, including JVM internals
  • Master best practices, low-level design rules, and coding conventions for writing well-designed, professional Java code with IntelliJ IDEA as IDE
  • Get real-world experience by developing an instructor-led, modern Spring Boot application with MySQL as database
  • Set firm foundation in Java for the rest of your career. It is akin to a Master's Program in Java
  • If entire course is done systematically, your Java skills will be on par with engineers at top product companies like Google
  • Master Object-Oriented Programming concepts by using a real-world application as a case study
  • Master Exceptions, Collections, Generics, Multithreading (incl. Virtual Threads), Databases, Functional-style Programming, etc. with best practices
  • Over 20 Coding Exercises, AI-based Job Interview Simulations with Voice, and several challenging Quizzes to validate your learning
  • [NEW} Spring Boot & Spring Framework Sections (incl. Maven) with Spring Boot project have been added
  • [NEW] In-depth lectures on Modern Java features like Virtual Threads and Pattern Matching for switch have been added

Course content

19 sections · 470 lectures · 90 hours of video 46 quizzes, 21 coding exercises, 1 practice test, 8 assignments, 45 articles

  1. 1Course Introduction 3 free previews3 lectures · 34 min
  2. 2Java: A High-level Overview 4 free previews17 lectures · 1 quiz · 2.8 hours
  3. 3Classes, Objects and their Members 3 free previews39 lectures · 8 quizzes · 7.6 hours
  4. 4Method Building Blocks: Operators & Control-flow Statements 3 free previews36 lectures · 10 quizzes · 7.5 hours
  5. 5Packages, Strings and Information Hiding Design Principle23 lectures · 5 quizzes · 4.2 hours
  6. 6Programming with IntelliJ & Eclipse: Tutorials17 lectures · 2.8 hours
  7. 7More java.lang & Coding Conventions 1 free preview19 lectures · 2 quizzes · 2.8 hours
  8. 8Case Study: A Social Bookmarking Application 1 free preview2 lectures · 14 min
  9. 9Serious OOP: Inheritance & Polymorphism 1 free preview21 lectures · 3 quizzes · 4.2 hours
  10. 10More Serious OOP: Abstract Classes & Interfaces25 lectures · 3 quizzes · 4 hours

Who it is for

The instructor says it suits

  • Complete beginners. We'll start from compilation & interpretation.
  • Experienced Java professionals who are not feeling confident about their existing Java skills
  • Developers wishing to learn industry-standard best practices & low-level design rules for building well-designed, production-grade software.
  • Programmers switching from other languages
  • Java developers who wish to quickly learn the right parts of Spring Framework & Spring Boot

What you need before you start

  • Ambition to become a strong software engineer capable of building production-grade software similar to that developed at top technology companies.
  • Desire to build rock-solid foundations in Core and Advanced Java, low-level software design rules, and industry-standard coding practices.
  • Top Concentration, Patience, and Perseverance. Around a year of your self-study effort has been meticulously structured into this 90 hour comprehensive bootcamp — it is not a quick crash course.

How it compares

Against the other 231 rated Udemy courses in Java on CourseDuck:

  • Rating4.4 out of 5higher than 37% of them
  • Reviews25,541#9 of 232 by number of reviews
  • Length89.9 hourslonger than 97% of them
  • Last updatedAugust 2026more recently than 89% of them

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Course Description

Recent Updates:  *** Updated to Java 25 ***

June '26: Added an excellent tutorial series on the #1 Java IDE— IntelliJ IDEA including lectures on Debugging & JUnit!

May '26: An in-depth lecture on Flexible Constructor Bodies (Java 25) has been added in Object-Oriented Programming section. Several other lectures in this section like Polymorphism & Constructor Chaining have been vastly improved with in-depth explanations involving real-world scenarios. Also, added 4 AI-based Job Interview Question Simulations with Voice — students will answer in their own voice with an AI-based Interviewer.

Jan '26: Several new in-depth lectures on Virtual Threads (Java 21) have been added in Concurrency Section. Virtual Threads are a major enhancement in Java that enable in building highly scalable Web applications.

Oct '25: New sections on Spring Boot & Spring Framework have been added with a short Maven tutorial as precursor. Course project has also now been extended into a modern Spring Boot Web application.

July '24: In-depth lectures on industry-standard Naming Conventions (under Coding Conventions series) have been added. These conventions are recommended by companies like Google and are followed within the Java library.

Course Introduction:

This Master Course has been meticulously developed for over a decade and follows a unique, industry-vetted curriculum to help you become a Complete & Professional Java Engineer. Its goal is to equip you with Java skills that are needed to be part of top engineering teams like the ones at Google and Amazon. It has over 140,000 students from over 170 countries ranging from complete beginners to experienced Java professionals. Top companies like IBM, TCS, Cognizant, Wipro, and others are actively using this course to upskill their employees. It has been consistently ranked as one of Udemy's top 3 paid Java courses and has helped countless students start their professional journey as "confident" Java programmers.

What Our Students are Saying:

"One of the best courses I have taken on coding in general! On par with courses you can take from Stanford Engineering Everywhere."  ~ Kaloyan T.

"This is hands down the greatest online course I've ever taken ... To really benefit from this course, you'll have to sit there and bang your head but if you take careful notes and make sure you can explain each step you're taking to solve a problem, you'll come out on top. I am now a data engineer and this course is one of the biggest catalysts for my transition into tech." ~ Carlvin Sanon

"With the help of your course, I was able to lead the cohort with my technical performance during our bootcamp and I have secured an internship at Microsoft!" ~ Imanuel Dartey

"Dheeru is fantastic. I have several years of experience at big tech companies, and I feel that this course is extremely well-designed. I love that Dheeru goes beyond simply teaching language features but actually goes into Production-grade best practices. Dheeru's passion for teaching and clear communication skills also really shines through. If you're looking to learn Java best practices that's applicable to real world, Production-grade systems, I'd highly recommend this course." ~ Je Yeong

"This is by far the best advanced as well as beginner course I have ever read/seen since Andre LaMothe quit writing" ~ Stephen Jonson

"Absolutely amazing, complete and in depth course. I would recommend this course to everyone interested in Java and programming in general. Dheeru Mundluru is an exemplary and responsive instructor. He explains the concepts with such clarity and with examples that every thing makes perfect sense. When I started this course, I only had vague idea of programming and now after completing this course I have a solid foundation to build upon. I would certainly say that due to this course I have fell in love with Java language and its ecosystem" ~ Muhammad Arsal Abdullah

"The Instructor is highly competent. He is a world-class instructor ... Taking this course will definitely give you a tremendous appreciation for this great language" ~ Carrel d'Haiti

"... I have been a Java developer for 8 years and hold a Masters degree in Computer Science ... This is honestly the very best online Java video course on the market... wish I had have had a course like this when I first started" ~ Clive Stewart

"The JVM internals section of this course itself is worth buying this course. Excellent teaching style." ~ Ryan Trang

Course Overview:

This course was built not just to teach Java, but with a larger goal of helping you become a complete & professional Java engineer right by the end of this course. To achieve this, it takes a holistic teaching approach:

  • Covers most of the Java language features at a very in-depth level.

  • Incorporates tons of industry-standard best practices and low-level design rules.

  • Guides you in building both Spring Boot & Jakarta (Java) EE-based Web application with real-world conventions and professional workflows.
Read More All Levels All Levels product length iconTime: 89.9h

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Instructor Details

Dheeru Mundluru

A passionate software engineer & educator, Dheeru has around 15 years of experience developing innovative software for start-ups in Silicon Valley and elsewhere. He holds a Ph.D. in Computer Science from University of Louisiana at Lafayette (USA). He is currently the CTO & Principal Instructor at his EdTech start-up, Semantic Square, through which he is involved in building world-class engineers. He is an experienced on-line instructor and has taught around 150,000 across the globe. In 2018, Udemy rated Dheeru as one of their top 10% most engaging instructors (from over 40k instructors). His engineering expertise includes developing complex Web data integration & mining software with Java as the main programming tool. Coming from start-up world, he also has extensive end-to-end experience in developing Web applications using technologies such as Spring Framework, Hibernate, MySQL, and Solr.

Dheeru is passionate about developing products that are easy-to-use, intelligent, and well-architected. Writing well-crafted code that follows best design practices is of utmost importance to him. He brings the same level of passion and completeness to his teaching.

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Reviews

4.4

25,541 ratings on Udemy

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By RAGAVI M on 8/9/2026

good experience and clear audio makes easy to understand, practice coding helps to build skill in programming

By Sai Charan on 8/1/2026

the introduction part was great as the sir explained everything that i need to study as college student

By Abhishek Thati on 7/9/2026

My experience with this exercise was positive. It took me a couple of attempts to understand how one class can use another class by creating an object and calling its methods. After fixing a few mistakes, I gained a much better understanding of object composition, method delegation, and code reusability. Solving the exercise gave me more confidence in applying object-oriented programming concepts in Java.

By Keenan Lynch on 5/22/2026

I enjoy the depth of instruction the instructor brings to the various topics. I look forward to continuing to learn more. The Thrillio project is also a fun way to apply the theory caught in the lectures.

By Debjoti Chandra on 5/18/2026

The English communication in this course is so unclear and difficult to follow that it becomes hard to understand the concepts properly. The technical explanation is also very weak and far below expectations. The course needs much better communication and clearer technical delivery.

By Je Yeong Soh on 4/18/2026

Dheeru is fantastic. I have several years of experience at big tech companies, and I feel that this course is extremely well-designed. I love that Dheeru goes beyond simply teaching language features but actually goes into Production-grade best practices. Dheeru's passion for teaching and clear communication skills also really shines through. If you're looking to learn Java best practices that's applicable to real world, Production-grade systems, I'd highly recommend this course.

By Travis Helms on 4/2/2026

Looks like it is exactly what I am looking for to refresh my skills and become a developer.

By Tarang Kumar on 2/20/2026

One of the most detailed pack course with easy to understand accent and detailed explanation of each and every single thing

By Anonymized User on 1/15/2026

Really Indepth course, though I was familiar with Java this course made me revise Java concepts and learn updated methods and new features.

By Axel Sasse on 1/6/2026

Der Kurs gefällt mir gut, das Niveau ist für mich angemessen - es könnte noch etwas anspruchsvoller sein.

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Overall Score : 88 / 100

Java In-Depth: Become a Complete Java Engineer! [2026]
Visit course on Udemy Write a review
  • Video Duration: icon 89.9h
  • Price: $139.99
  • Provider: icon Udemy
  • Updated: icon August 2026
  • Level: All Levels All Levels
  • Language: icon English
  • Certificate: icon Yes
  • Lectures:470 in 19 sections
  • Practice:46 quizzes, 21 coding exercises, 1 practice test
  • Students:145,800
  • Subtitles:10 languages
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