/*
  An example from Java: A beginners's guide by Herbert Schildt that
  illustrates the the strongly typed nature of Java.  A reference for one
  type of object cannot normally refer to another type of object except 
  when a reference of a superclass is referred to an object that's a 
  subclass.
  v1 - won't compile.
  v2 - uses inheritance and will compile
*/

public class Xv2
{
    private int a;

    public Xv2 (int i)
    {
	a = i;
    }

    public int getA () 
    {
	return a;
    }

    public void setA (int n)
    {
	a = n;
    }
}