GameSettings.java

package tictactoe;

import static tictactoe.TictactoeConstants.*;

public class GameSettings {

    private UI ui;
    private int boardSize;
    private Player playerOne;
    private Player playerTwo;
    private Player playerFirstMove;

    public GameSettings() {
    }

    public void getAllSettings() {
        this.ui = new UI();
        this.playerOne = returnPlayer(X_MARKER);
        this.playerTwo = returnPlayer(O_MARKER);
        this.playerFirstMove = randomizePlayerFirstMove();
        returnBoardSize();
    }

    public Player randomizePlayerFirstMove() {
        int rand = (Math.random() < 0.5) ? 0 : 1;
        if (rand == 0) {
            return this.playerOne;
        } else {
            return this.playerTwo;
        }
    }

    public Player generatePlayer(String type, String marker) {
        if (type.equals(HARD_COMPUTER)) {
            return new AIPlayer(marker);
        } else if (type.equals(EASY_COMPUTER)) {
            return new ComputerPlayer(marker);
        } else {
            return new HumanPlayer(marker);
        }
    }

    public Player returnPlayer(String marker) {
        ui.requestPlayerType(marker);
        String type = ui.returnPlayerType();
        validatePlayerType(type, marker);
        if (type.equals(HUMAN_PLAYER))
            return generatePlayer(type, marker);
        else {
            String level = getComputerDifficulty(marker);
            return generatePlayer(level, marker);
        }
    }

    public void validatePlayerType(String type, String marker) {
        if ((!type.equals(HUMAN_PLAYER) && (!type.equals(COMPUTER_PLAYER)))) {
            ui.badInputMessage(type);
            returnPlayer(marker);
        }
    }

    ...
}