How to get all types of the inner structures of a nested type?

Question

I have a function bellow,

public void park( List>> l){ System.out.println(\"park\"); }

and when I tried

Answer 1

You can get this information through the ParameterizedType interface.

For example:

final Type parameterType = method.getGenericParameterTypes()[0]; // List<List<List<Integer>>>

if (parameterType instancof ParameterizedType) {
    final Type nextDown // List<List<Integer>>
        = ((ParameterizedType) parameterType).getActualTypeArguments();
}

And keep repeating until it is not a ParameterizedType.