How to initialize field in subclass inherited from base class Java [duplicate]

This question already has an answer here:

• Abstract class with final uninitialized field 4 answers
• In Java, why can't I declare a final member (w/o initializing it) in the parent class and set its value in the subclass? How can I work around? 8 answers

I have a few final fields which I have declared in a base class, I want to initialize those fields in a subclass? Is this possible? Note the fields in the base class are declared final, so some trickery may be required

class Base
{
   public final String a;
   public final String b;
}

class Sub
{
   public Sub(String a, String b)
   {
      a = a;
      b = b;
   }
}

Something like this? Any help would be appreciated