Represents a wildcard type argument.
Examples include:
?
? extends Number
? super T
A wildcard may have its upper bound explicitly set by an
extends clause, its lower bound explicitly set by a
super clause, or neither (but not both).
author: Joseph D. Darcy author: Scott Seligman author: Peter von der Ahé version: 1.9 07/05/05 since: 1.6 |