In my book “Getting Started with Java on the Raspberry Pi”, I give more info about IDEs (= Integrated Development Environment) for Java development. My prefered ones are JetBrains IntelliJ IDEA and Microsoft Visual Studio Code (VSC). IntelliJ IDEA is the most used IDE by Java developers and is available in a free edition with some limited features, or a full paid version.
In “The MagPi Magazine” #93 and #94, published by the Raspberry Pi Foundation, you can find two articles which describe how you can get started with Java, Maven, Visual Studio Code and Pi4J on the Raspberry Pi. To make everything even more clear, I created a step-by-step video on Vimeo which shows everything which is described in those two articles.
Great move of Microsoft! They provide an all-in-one installer for Java dependencies and Visual Studio Code. Take a look at https://devblogs.microsoft.com/visualstudio/announcing-visual-studio-code-java-installer/ “So today, we’re releasing a special Installer of Visual Studio Code for Java developers. The package can be used as a clean install or an update for existing environment to add Java or Visual Studio Code to your development environment.