Untitled

import java.util.*;

public class Program {
    enum GameResult {
        WIN,
        LOSE,
        TIE;

        public static GameResult otherTeamResult(GameResult result) {
            switch (result) {
                case WIN:
                    return LOSE;
                case LOSE:
                    return WIN;
                case TIE:
                    return TIE;
            }
        }
    }

    class Team {
        private int score = 0;
        private String name;

        public Team(String name) {
            this.name = name;
        }

        public void applyGameResult(GameResult result) {
            switch (result) {
                case WIN:
                    score += 3;
                    break;
                case LOSE:
                    score -= 1;
                    break;
                case TIE:
                    score += 1;
                    break;
            }
        }

        public int getScore() {
            return score;
        }

        public Name getName() {
            return name;
        }
    }

    class Game {
        public String team1;
        public String team2;
        public GameResult team1Result;
    }

    public static void main(String[] args) {
        List<Game> games = new ArrayList();
        // add all the game data to games

        HashMap<String, Team> teams = new HashMap();
        // add all the teams to the hashmap

        for (Game game : games) {
            Team team1 = teams.get(game.team1);
            Team team2 = teams.get(game.team2);

            team1.applyGameResult(game.team1Result);
            team2.applyGameResult(GameResult.otherTeamResult(game.team1Result));
        }

        Team[] leaderboard = Arrays.sort(
                teams.values().toArray(),
                (team1, team2) -> team1.getScore().compareTo(team2.getScore())
        );

        // do whatever with your sorted leaderboard
    }
}