How to Install Java repository in IntelliJ IDEA - grigory-lobkov/java1 GitHub Wiki
To install this repository, open it as a new project
Type the url of desired project, ex."https://github.com/grigory-lobkov/java1.git" and press "Clone"
Open "File" -> "Project Structure..."
Choose your version of SDK
Specify the project output
Go to "Modules", "Sources" and mark the "src" folder as "Source" type. Press "OK".
Open folder structure, choose the desired module, right-click on it, choose "Run"
If you will see message like this, choose "Cancel"