UI.java

public String getNextMove() {
        String move = "0";
        while (!board.validMove(move)) {
            try {
                move = bufferedReader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (NumberFormatException e) {
                e.printStackTrace();
            } finally {
                if (!board.validMove(move)) {
                    badInputMessage(move);
                }
            }
        }
        return move;
    }