Question

class Super<T> {}

class Child<A, B> extends Super<B> {}

class Code {
  public void method(Child<String, Integer> child) {}
}

I can use reflection to get the parameter type:

ParameterizedType ptype = (ParameterizedType) Code.class.getMethod("method").getGenericParameterTypes()[0]

But how can I get the generic superclass of ptype (meaning, not only Super.class, but also the type parameter Integer)

My use case is that I want to use reflection to determine if one of the arguments of a method is a Collection of MyClass objects (I don’t have an actual argument instance to check)

Answer 1

Type parameters are erased in java during compilation. Look here or there. So you probably will not able to do this.