Question

In a nutshell, I’m trying to do the inverse of “classObject.getDeclaredClasses()“.

I have a method that receives an object of type Class<? extends Object>. I want to figure out whether it is an inner class, and if it is, I want to access the surrounding class’ object instance.

Is there a smart API for this, or am I forced to do some string manipulation and parsing?

Answer 1

You are looking for the Class.getDeclaringClass() method:

public Class getDeclaringClass()

If the class or interface represented by this Class object is a member of
another class, returns the Class object representing the class in which it
was declared. This method returns null if this class or interface is not a
member of any other class. If this Class object represents an array class,
a primitive type, or void,then this method returns null.

Returns: the declaring class for this class