Can You Have Multiple Classes in a Single Java File?

Multiple Classes in a Java File

In Java, it is possible to have multiple classes within a single .java file. However, there can only be one public top-level class, and it must have the same name as the source file.

The purpose of having multiple classes in a file is to organize logically related code. These classes often include support functionality, such as internal data structures or utility methods, for the public top-level class. By bundling them together, you keep related code in one place, making your code more readable and maintainable.

It's important to note that while it's possible to have multiple classes in a file, it's not necessary. If you're unsure whether to create multiple classes, consider the readability and maintenance of your code. If bundling related code improves these aspects, then having multiple classes is a good option. However, if it doesn't provide any significant benefits, you can opt for a single class in your .java file.

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