Welcome to CodeJava.net - where Java gets a little less painful.
Here you’ll find hundreds of practical tutorials, step-by-step guides, code examples, and sample projects covering everything from Core Java and Java SE to Jakarta EE, Spring Framework, Spring Boot, and more.
No magic. No unnecessary theory. Just Java explained with real code you can actually use.
Our goal is simple: help you learn faster, code better, and maybe enjoy Java a little more along the way.
Why does a small part of your code do most of the work, cause most of the bugs, and steal most of your time?
Watch this funny video to find out:
Absolutely New to Java programming?
Get started in minutes with the following well-written tutorials that help you walk the very first steps in Java programming world:
What is Java?
Understand key features of Java programming language
How to write, compile and run your first Java program
Prefer reading over watching videos? No problem - we’ve got plenty of Java for your eyeballs.
Browse all our Java programming tutorials, neatly organized into categories like Java Core, Java SE, Jakarta EE, Spring Framework, Spring Boot, and more.
Prefer watching code instead of reading walls of text? We’ve got you covered.
Head over to our YouTube channel and watch Java, Spring, and Spring Boot coding in action - bugs, fixes, and all.
Latest Java Tutorials:
We regularly add and update Java posts on weekly basis. Below are the recently added posts:
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Discover how the 80/20 rule applies to real-world programming and software development, from reading code and fixing bugs to performance, teamwork, li [ ... ]
Code examples to implement an authorization server with persistent client credentials using Spring Security OAuth2 Authorization Server library. The c [ ... ]
Code examples about modifying the JWT access tokens generated by Spring authorization server, including add, update and remove claims.
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Featured Java Tutorials:
These Java tutorials are recommended read for programmers at any level. Read them to get insights and gain in-depth understanding about Java programming:
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Understanding equals() and hashCode() in Java
Understanding Object Ordering in Java with Comparable and Comparator
How to get Java Certifications - 5 Steps to Become a Certified Java Programmer
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