private void checkState() {
  if(game.isWin(human)) {
   gameOver("Congratulations, You've Won!");
  }
  if(game.isWin(computer)) {
   gameOver("Sorry, You Lose!");
  }
  if(game.nextMove(human)==null && game.nextMove(computer)==null) {
   gameOver("Draw, Click 'Play' For Rematch!");
  }
 }