bounded-wildcard – IT Nursery

Java Generics With a Class & an Interface – Together

May 7, 2022 by IT Nursery

I want to have a Class object, but I want to force whatever class it represents to extend class A and implement interface B. I can do: Class<? extends ClassA> Or: Class<? extends InterfaceB> but I can’t do both. Is there a way to do this? 3 Answers 3

What is PECS (Producer Extends Consumer Super)?

April 20, 2022 by IT Nursery

I came across PECS (short for Producer extends and Consumer super) while reading up on generics. Can someone explain to me how to use PECS to resolve confusion between extends and super? 16 s 16 tl;dr: “PECS” is from the collection’s point of view. If you are only pulling items from a generic collection, it … Read more