public class BoggleDie
{
    String letters;
    int facing;
    public BoggleDie(String letters, int facing)
    {
        if (letters.length() != 6 || facing < 0 || facing > 5)
        {
          throw new IllegalArgumentException("Die Constructor");  
        }
        this.letters = letters;
        this.facing = facing;
        
    }
    public BoggleDie(String letters)
    {
        this(letters,0);        
    }
    
    public char getTop()
    {
        return letters.charAt(facing);
    }
    
    public void setFacing(int facing)
    {
        this.facing = facing;
    }    
}