Java field type for a value of a generically recursive self-type?

Question

Given a class hierarchy where the base class defines a recursive self-type:

abstract class A> { }

How can I decl

Answer 1

If you bound the wildcard ? below by A, it should work:

public class B {
    private A<? extends A> a;

    public <T extends A<T>> void setA(T a) {
        this.a = a;
    }
}