If the necessary JDK is already defined in IntelliJ IDEA, select it from the Project SDK list. To develop Java applications in IntelliJ IDEA, you need the Java SDK ( JDK).

In the New Project wizard, select Java from the list on the left. Otherwise, from the main menu, select File | New Project. If the Welcome screen opens, click New Project. In IntelliJ IDEA, a project helps you organize your source code, tests, libraries that you use, build instructions, and your personal settings in a single unit.

Prepare a project Create a new Java project