This is an in-depth java tutorial for beginners. Learn what Java is, how to get started, and how to build basic apps using key concepts!

In a previous Java 101 tutorial, you learned how to better organize your code by declaring reference types (also known as classes and interfaces) as members of other reference types and blocks.

Use Java assertions to test your assumptions about program correctness and check them in your code.

Here's a quick JDBC with HSQLDB tutorial to get you up and running with Java database connectivity and the popular HyperSQL database.

SonarQube, originally known as simply Sonar, is an open source tool that can inspect both the source code and the compiled code of over 20 different languages, including Java, JavaScript, Swift, ...