1. class ClassA {2.   public int numberOfInstances;3.   protected ClassA(int numberOfInstances) {4.    this.numberOfInstances = numberOfInstances;5.   }6. }7. public class ExtendedA extends ClassA {8.   private ExtendedA(int numberOfInstances) {9.    super(numberOfInstances);10.   }11.   public static void main(String[] args) {12.    ExtendedA ext = new ExtendedA(420);13.    System.out.print(ext.numberOfInstances);14.   }15. }