How to check if a class is nested?

[KWINEKO]

I want to get the full class name of a nested class in the following format
gc.ph.Activity+DialogType
Currently, I can only get gc.ph.Activity.DialogType through .type.name
and I don’t know how to check whether it is a nested class

[KWINEKO]

I find out how to judge. Use .type.class.declaringClass/.type.class.nestedClasses.