Java: returning subclass in superclass method signature

Question

I\'m working on a problem where there are several implementations of Foo, accompanied by several FooBuilder\'s. While Foo\'s share sev

Answer 1

Generics might be the way to go here.

If you declare setA() something like this (pseudo-code)

 T setA(int a)

the compiler should be able to figure out the real types, and if it doesn't you can give hints in the code like

obj.setA(42)