ConnectN

Game.java

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Game {
    
    private Character board[][];
    private int dimensions;
    private List<Character> players;
    private int conditionToWin;
    private Character winner = null;
    private boolean gameFinished = false;
    private Scanner in;
    private int turn;
    
    public Game(int dimensions, int conditionToWin, List<Character> players) {
        board = new Character[dimensions][dimensions];
        this.dimensions = dimensions;
        this.players = players;
        this.conditionToWin = conditionToWin;
        this.in = new Scanner(System.in);
    }
    
    
    private void run() {
        this.turn = 0;
        Character turnChar;
        while (!this.gameFinished) {
            System.out.println(boardToString(this.board));
            turnChar = this.players.get(this.turn % this.players.size());
            System.out.println("Turn for " + turnChar);
            System.out.print("Choose coordinate(row col)(ie: 2 2): ");
            int x = in.nextInt() - 1;
            int y = in.nextInt() - 1;
            if (this.board[x][y] == null) {
                this.board[x][y] = turnChar;
                checkStatus();
                this.turn++;
            } else {
                System.out.println("Already occupied! Try again!");
            }
        }
        System.out.println(boardToString(this.board));
        System.out.println("Winner: " + this.winner);
    }
    
    private void checkStatus() {
        int pieces;
        Character piece;
        
        // Horizontal:
        for (int i = 0; i < this.dimensions; i++) {
            pieces = 0;
            piece = null;
            for (int j = 0; j < this.dimensions; j++) {
                if (this.board[i][j] != null) {
                    if (this.board[i][j].equals(piece)) {
                        pieces++;
                    } else {
                        pieces = 1;
                        piece = this.board[i][j];
                    }
                }
                if (pieces >= this.conditionToWin) {
                    this.winner = piece;
                    this.gameFinished = true;
                    return;
                }
            }
        }
        
        // Vertical
        for (int i = 0; i < this.dimensions; i++) {
            pieces = 0;
            piece = null;
            for (int j = 0; j < this.dimensions; j++) {
                if (this.board[j][i] != null) {
                    if (this.board[j][i].equals(piece)) {
                        pieces++;
                    } else {
                        pieces = 1;
                        piece = this.board[j][i];
                    }
                }
                if (pieces >= this.conditionToWin) {
                    this.winner = piece;
                    this.gameFinished = true;
                    return;
                }
            }
        }
        // Diagonal1 TODO
        
        // Diagonal2 TODO
        
    }
    
    private String boardToString(Character board[][]) {
        StringBuilder b = new StringBuilder();
        
        for (int i = 0; i < this.dimensions; i++) {
            for (int j = 0; j < this.dimensions; j++) {
                if (this.board[i][j] != null)
                    b.append(" "+this.board[i][j]+" ");
                else 
                    b.append(" - ");
            }
            b.append("\n");
        }
        
        return b.toString();
    }

    public static void main(String[] args) {
        List<Character> p = new ArrayList<Character>();
        p.add('X'); p.add('O');
        Game m = new Game(3, 3, p);
        m.run();
    }

}