Exception declaration with Method overriding

If a language supports Exception Declaration, this is how it likely works with method overriding.

Case 1: Super class doesn't declare an exception

Sub class overridden method:

• cannot declare a Checked Exceptions but
• can declare an Unchecked Exceptions.

Case 2: Super class declares an exception

Sub class overridden method

• can declare
  • same exception
  • subclass exception (Variance = covariant)
  • or no exception but
• cannot declare parent exception