You will see an application called IntelliJ IDEA on the department machines. To download IntelliJ on your own machine, you will first want to go here to apply for the free version for students. The java development environment is IntelliJ IDEA. The recommended install from JetBrains is downloading the JetBrains Toolbox and selecting IntelliJ once it is installed. That will keep it updated on your computer and easy to manage other IDEAs from them.