Can Multiple Classes Exist in the Same Java File?

Can Classes Coexist Within a Java File?

In Java, the convention dictates that each Java source file (.java) should contain only one public top-level class. It follows the same naming convention, where the public class name must match the file name. However, this does not rule out the possibility of having multiple classes within a single Java file.

The key lies in understanding the concept of top-level classes and inner classes. A public top-level class is accessed directly from the file's entry point, while inner classes are defined and nested within other classes. This allows you to organize related functionalities and support structures within the same source file, enhancing code readability and organization.

So, yes, you can have multiple classes in a Java file, but only one public top-level class, while the others are considered inner classes.

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