Java generics type parameter hiding

Question

I\'m defining a class:

class Foo> {
}

the compiler is complaining about I being

Answer 1

If I is already defined in the outer class just make this

public class Outer<I extends Bar & Comparable<I>> {
  public class Foo<I> {
  } 
}

You cannot redefine I in your inner class. The I of the inner class would be something else than the I of the outer class, if this is what you want, well, rename it.

HTH

Answer 2

Don't make the inner class parameterized:

class Baz<I extends Bar & Comparable<I>> {
   class Foo {
   }
}

As an inner (non-static nested) class, I as defined in the Baz declaration will still have meaning in Foo, since every Foo will have an implicit reference to its outer Baz instance.