How to create a new class in Java.

To create a new class in Idea, follow these steps:

1. Select an appropriate location in the project’s source code folder, right-click on that location, then choose “New” -> “Java Class”.
2. In the pop-up dialog box, enter the name of the class, and then click “OK”.
3. Idea will automatically create a new Java class file and open it for you.
4. In the class file, you can input the content of the class, including member variables, constructors, and member methods.
5. After entering the contents of the class, you can save the file by pressing Ctrl+S.

In this way, you have successfully created a new class within Idea. Make sure to create a Java project first and operate within the source code folder of the project before creating the new class.