Learn Java

Creating your first Java application.

Launching Single-File Source-Code Java programs with the Java launcher.

jshell interactively evaluate declarations, statements, and expressions of the Java programming language in a read-eval-print loop (REPL).

How to compile and execute the preview features available in the JDK.

Introducing the object oriented programming.

Getting to know the basics of the Java language.

How to model your immutable data with records to make your code simpler and more readable.

Defining your own classes, declaring member variables, methods, and constructors.

Understanding numbers, characters and strings of characters.

Leveraging inheritance in Java applications.

Creating and using interfaces.

Working with parameterized types.

Using Lambda Expressions to improve the readability of your code.

Annotations is a form of metadata, provide data about a program that is not part of the program itself. Annotations have no direct effect on the operation of the code they annotate.

How to bundle classes and interfaces into packages, how to use classes that are in packages, and how to arrange your file system so that the compiler can find your source files.

All about pattern matching.

Using exceptions to handle errors and other exceptionnal events.

Getting to know the Collections Framework to store and retrieve data in collections and hashmaps.

Process your in-memory data with Java streams and collectors. Process them faster with parallel streams.

Understand how the module system shapes the JDK and how you can use it to make your code base more maintainable.

Learn how to use the command line tool jlink to create custom-made runtime images or self-contained application images.

Learn about the tools the JDK gives you to compile, run, analyze and monitor your code.

Learn about the tools the JDK gives you to monitor your application.

Packaging your application to create a native installer.

Setting security policies with the JDK tools and commands.

Learn about the tools the JDK gives you to troubleshoot Java applications and the Java Virtual Machine (JVM).

Understanding the key aspects of how garbage collection works in Java and how to tune garbage collection.

Understanding how to use Class-Data Sharing in HotSpot to improve JVM performance.