Game.java

import java.util.ArrayList;
import java.util.ArrayDeque;
import java.util.List;
import java.util.Optional;
import java.util.Queue;

public class Game {
    private final Queue<Player> turnOrder = new ArrayDeque<>();
    private final Board board;
    private final Dice dice;
    private final StartStrategy startStrategy;
    private final EndStrategy endStrategy;
    private final boolean requireExactToFinish = true;

    public Game(List<Player> players, List<Entity> entities, int boardSize, int diceSides,
            StartStrategy startStrategy, EndStrategy endStrategy) {
        players.forEach(turnOrder::offer);
        this.board = Board.getInstance(boardSize, entities);
        this.dice = Dice.getInstance(diceSides);
        this.startStrategy = startStrategy;
        this.endStrategy = endStrategy;
    }

    public void play() {
        // this will basically give all the entities the starting position = 0
        startStrategy.apply(turnOrder);
        // this will just get the last cell
        int last = board.getLastCell();

        while (true) {
            // this is just turn wise playing
            Player p = turnOrder.poll();
            int roll = dice.roll();
            // sets the new position according to new dice value
            p.moveForward(roll, last, requireExactToFinish);
            // this checks if there is any snake or ladder at the new position and changes position accordingly
            applyEntities(p);
            // for now the end strategy is just first player to reach end wins
            System.out.println(p.getName() + " rolled " + roll + " -> " + p.getPosition());
            if (endStrategy.checkWinCondition(p, last)) {
                System.out.println(p.getName() + " wins!");
                break;
            }
            turnOrder.offer(p);
        }
    }

     private void applyEntities(Player player) {
        // this itration and maxItration is nothing, jist to avoid infinite loops
        int itration = 0;
        int maxItration = 20;
        while (itration < maxItration) {
            Optional<Entity> entitiesOpt = board.getEntityAt(player.getPosition());
            if (entitiesOpt.isEmpty())
                break;
            Entity entity = entitiesOpt.get();
            int from = player.getPosition();
            int to = entity.apply(from);
            if (to == from)
                break; 
            player.setPosition(to);
            itration++;
        }
    }

    public static void main(String[] args) {

        List<Player> players = new ArrayList<>();
        players.add(new Human("Riya"));
        players.add(new Bot("Bot1"));
        players.add(new Bot("Bot2"));
        players.add(new Human("Rushikesh"));

        List<Entity> entities = new ArrayList<>();
        Snake s1 = new Snake();
        s1.start = 14;
        s1.end = 7;
        entities.add(s1);
        Snake s2 = new Snake();
        s2.start = 98;
        s2.end = 79;
        entities.add(s2);
        Ladder l1 = new Ladder();
        l1.start = 3;
        l1.end = 22;
        entities.add(l1);
        Ladder l2 = new Ladder();
        l2.start = 5;
        l2.end = 8;
        entities.add(l2);

        Game game = new Game(players, entities, 10, 6, new DefaultStartStrategy(), new DefaultEndStrategy());
        game.play();
    }
}