Check if a type is an interface

Question

I want to validate a parameter sent to a method, it must be an interface type. What to ask?

void (Class<I> interfaceType){
  if (thisisnotaninterface){
    throw...
  }
}

Answer 1

You have got a Class#isInterface() method that does exactly what you want: -

if (!interfaceType.isInterface()) {
    throw...
}