public class Person
{
    private Date birthDay;
    private String name;

    // constructors

    // no accessor/mutator for name
}

public class Student extends Person
{
    private double gpa;

    public void createNickName( String nickName )
    {
	// how to change Name in Person???
    }
}


public class PersonDemo
{
   public static void main (String[ ] args )
   {
	Person bob = new Person( );

	System.out.println("Bob's name is " + ??????);
   }
}