Should I refactor static nested classes in Java into separate classes?

Jorn statement is correct and it's usually manifests itself as the following rule of thumb.

It depends on what the class is used for. If it's coupled to the outer class, for example, just like Map. Entry, just leave it in.

However, if it makes sense to use the class without its enclosing type, you may as well promote it to a top level class.

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