Java generics parameter bounding to any of a range of types

Question

Is there a syntax or workaround to constrain a generic type parameter to any of a range of types?

I am aware that you can constrain a type to be all

Answer 1

While Java has limited support for "intersection types" like T1 & T2, support for "union types" is scanty.

Generic types with wildcard are actually union types: G is the union of all G where S is a subtype of X.

No support for union of arbitrary two types.

Java 7's multi-catch syntax looks like it supports union of arbitrary exception types

catch (IOException|SQLException ex){ .. }

but not really, the type of ex is a fixed super class, not a union of the two classes.