Declare final variable, but set later

Question

I know this is fairly simple topic, but I really want to wrap my head around it.

This is what I\'m trying to do, but it doesn\'t like the final modifier. Is there an

Answer 1

private final long mId;

final reference cann't be modified at runtime as per java spec. So, once you declared it as final, mId can't point to something else throughout its lifetime (Unless you use reflection (or) wrap the value in object and modify it through other reference).