What would be the use of accepting itself as type arguments in generics
- by Newtopian
I saw some code on an unrelated question but it got me curious as I never saw such construct with Java Generics. What would be the use of creating a generic class that can take as type argument itself or descendants of itself. Here is example :
abstract class A<E extends A> {
abstract void foo(E x);
}
the first thing that came to mind would be a list that takes a list as parameter. Using this code feels strange, how do you declare a variable of type A ? Recursive declaration !?
Does this even work ? If so did any of you see that in code ? How was it used ?
