Install IntelliJ IDEA Development Environment

IntelliJ IDEA (also known simply as IDEA) is an "integrated development environment", aka an IDE, specifically for Java development. It has many powerful features making it easy and fun to work with Java code, such as automated refactoring tools, unit test runners, and much, much more.

Download

To download IntelliJ IDEA (at least 2019.1), visit this link and select the Community edition.

You can also choose the "Ultimate" edition, which has a 30-day free trial.

Install

When you first start IntelliJ IDEA, there's a wizard to walk you through various settings, but for now select Skip All and Set Defaults. You can always go to Preferences later to change these (and many other) settings.

Once the "Welcome" screen appears, then you're done!