Generics in Java | Wildcards | lower bound | upper bound | T extends | ? extends | ? supper

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Generics in Java

Generics T can be at
class level
interface level
method level

Wildcards ?
lower bound ? extends
upper bound ? supper
unbounded ?

Type parameter - T in class Foo T {} // Declaration
Type argument - String in Foo String obj // Use

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Really great and depth explanation about Java Generics

gokulkadnar

Crystal clear explanation. Thank you.

jlee

this is one of best explanation I have seen, could you please help me understand one thing .. m(List<? super X>) where X is an interface.. how it will work.

Flower_withanshi

nice explanation! I learned intersection type here . thanks

veerendrashukla

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