Java / Generics

What is Bounded wild-cards in Generics?

Bounded Wildcards impose bound on Type.

There are two types of Bounded wild-cards.

<? extends T>
<? super T>

Bounded wildcards are specified by List<? extends SuperClassType>

Bounded wildcards <? extends T> which impose an upper bound by ensuring that type must be sub class of T.

<? super T> imposes lower bound by ensuring Type must be super class of T.

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