Access Modifiers - Java File Requirements Continued

Now that we know about access modifiers, it's important to understand how they relate to Java file naming conventions. Here are the key rules:

1. If a Java file contains a public class, the file name must match the class name exactly (including case) and have a .java extension.

2. A Java file can contain multiple classes, but only one of them can be declared as public. The public class must be the one that matches the file name.

3. If a Java file does not contain any public classes, it can have any name, but it's still a good practice to name the file after one of the classes it contains for clarity.