04. Teamwork projects

package Fundamentals;

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int teamCount = Integer.parseInt(scanner.nextLine());

        List<Team> teams = new ArrayList<>();

        for (int i = 1; i <= teamCount; i++) {
            String[] inputCreatorTeam = scanner.nextLine().split("-");

            String creator = inputCreatorTeam[0];
            String team = inputCreatorTeam[1];

            Team newTeam = new Team(team, creator);

            if (isTeamExist(teams, team)) {
                teams.add(newTeam);
                System.out.printf("Team %s has been created by %s!\n", team, creator);
            } else {
                for (Team currentTeam : teams) {
                    if (currentTeam.getName().equals(team)) {
                        System.out.printf("Team %s was already created!\n", team);
                    } else if (currentTeam.getCreator().equals(creator)) {
                        System.out.printf("%s cannot create another team!\n", creator);
                    }
                }
            }
        }

        String inputCommand = scanner.nextLine();

        while (!inputCommand.equals("end of assignment")) {
            String[] inputUserTeam = inputCommand.split("->");

            String userToJoin = inputUserTeam[0];
            String teamToJoin = inputUserTeam[1];

            if (isTeamExist(teams, teamToJoin)) {
                System.out.printf("Team %s does not exist!\n", teamToJoin);
            } else {
                if (isMemberExist(teams, userToJoin)) {
                    System.out.printf("Member %s cannot join team %s!\n", userToJoin, teamToJoin);
                } else {
                    for (Team team : teams) {
                        if (team.getName().equals(teamToJoin)) {
                            team.addMember(userToJoin);
                        }
                    }
                }
            }
            inputCommand = scanner.nextLine();
        }

        teams.sort(Comparator.comparing(Team::getName));
        teams.sort(Comparator.comparing(Team::membersCount).reversed());

        for (Team currentTeam : teams) {
            currentTeam.getMembers().sort(String::compareTo);
            if (!currentTeam.getMembers().isEmpty()) {
                System.out.println(currentTeam.getName());
                System.out.printf("- %s\n", currentTeam.getCreator());
                for (String member : currentTeam.getMembers()) {
                    System.out.printf("-- %s\n", member);
                }
            }
        }

        System.out.println("Teams to disband:");
        for (Team team : teams) {
            if (team.getMembers().isEmpty()) {
                System.out.println(team.getName());
            }
        }
    }

    private static boolean isMemberExist(List<Team> teams, String userToJoin) {
        for (Team team : teams) {
            if (team.getMembers().contains(userToJoin) || (team.getCreator().equals(userToJoin))) {
                return true;
            }
        }
        return false;
    }

    private static boolean isTeamExist(List<Team> teams, String teamToJoin) {
        for (Team team : teams) {
            if (team.getName().equals(teamToJoin)) {
                return false;
            }
        }
        return true;
    }

}

package Fundamentals;

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

public class Team {

    private String name;
    private String creator;
    private List<String> members = new ArrayList<>();

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

    public String getName() {
        return name;
    }

    public String getCreator() {
        return creator;
    }

    public List<String> getMembers() {
        return members;
    }

    public int membersCount() {
        return members.size();
    }

    public void addMember(String memberName) {
        members.add(memberName);
    }

}