Bounded and unbounded wildcards in Generics are two types of wildcards available on Java. Any Type can be bounded either upper or lower of the class hierarchy in Generics by using bounded wildcards. In short <? extends T> and <? super T> represent bounded wildcards while <?> represent an unbounded wildcard in generics. In our last article How Generics works in Java, we have seen some basic details about bounded and unbounded wildcards in generics and In this Java tutorial, we will see bounded and unbounded generics wildcards in detail.