Location

The code

 1   class Location
 2   {
 3     public Fox Fox;
 4     public Warren Warren;
 5  
 6     public Location()
 7     {
 8       Fox = null;
 9       Warren = null;
10     }
11   }

Explanation

A location has 2 data items within the class, a Fox called Fox and a Warren called Warren.

When the location is created both are set to null, this means they are empty. So each location could store only one Warren and one Fox. This class is used for each square of the grid.