/**
 * Purpose: A class from which objects might be created, which behave like
 *          sheep.  Demonstrates use of classes to represent classes
 *          of objects in real life, and the difference between using
 *          or omitting static.
 */

public class Sheep
{
    // each sheep is kept in a pen for which the number is
    private int penNumber;

    // total number of sheep created from this class
    private static int totalSheep = 0;

    // sheep constructor
    public Sheep(int n)
    {
        penNumber = n;
        totalSheep ++;
        return;
    }

    // find which pen a sheep is in
    public int find()
    {
        return penNumber;
    }

    // move sheep to another pen
    public void moveTo(int differentPen)
    {
        penNumber = differentPen;
        return;
    }

    // count all sheep
    // NB: this is a static method, and it doesn't
    //     use any non-static variables
    public static int countAll()
    {
        return totalSheep;
    }
}