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Editorial Team
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Asked: 2026-05-18T03:55:10+00:00

I have two options (which technically are the same, as I understand) to declare

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I have two options (which technically are the same, as I understand) to declare a custom exception class thrown only from a particular class com.XXX.Foo:

  • as a public class in the package: com.XXX.CustomException
  • as a public static inner class: com.XXX.Foo.CustomException

Which option is better?

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1 Answer

  1. Editorial Team

    In case the exception is very specific to Foo class, I don’t mind keeping it as a public Nested class. And whenever it seems like a time to extract that out, simply extract that out.

    In general practice, I have never seen any nested class defined for Exception, though. I also don’t know if one exist in Java API.

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