TomsAlgorithm tom = new TomsAlgorithm();
DavesAlgorithm dave = new DavesAlgorithm();
int[] move;
int winner;

while (!(endGame))  {
   move = tom.chooseMove();
   if (move==null) {
       winner = dave.player;
       endGame = true;
   }
   move = dave.chooseMove();
   if (move==null)
       winner = tom.player;
       endGame = true;
   }
}