Double generic constraint on class in Java: extends ConcreteClass & I

Is there a way to define a generic constraint in Java which would be analogous to the following C# generic constratint ?

class Class1<I,T> where I : Interface1, Class2 : I

I'm trying to do it like this:

class Class1<I extends Interface1, T extands I & Class2>

But the compiler complains about the "Class2" part: Type parameter cannot be followed by other bounds.

From stackoverflow axk

• This code compiles here fine:

  interface Interface1 {}
  
  class Class2 {}
  
  class Class1<I extends Interface1, T extends Class2 & Interface1> {}
  

  Why do you need the I type there when you assume only Interface1 anyway? (you won't know anything more in your class about I than it extends Interface1)

  axk : The point is that "T extends Class2 & I" not "T extends Class2 & Interface1" when you specify concrete classes for both parameters
  From mitchnull

• The simplest way I can see of resolving the Java code is to make Class2 an interface.

  You cannot constrain a type parameter to extends more than one class or type parameter. Further, you can't use super here.

  From Tom Hawtin - tackline