The problem is because the call to methodA in class Process calls methodA in Processor but variable b in Processor hasn't been initialized yet. The order of initialization is super class first then sub-class. Since your still in the super class constructor Java hasn't gotten to the point where variables in the sub-class have been initialized. By the timee you get to the metehod call in the sub-class constructor the sub-class variables have been initialized. That's why the second call to methodA prints 126.