Audition (JAVA 8)

import java.util.*;
import java.util.stream.*;

public class AuditionTest {

    public static void main(String[] args) {
        Audition audition = new Audition();
        List<String> cities = new ArrayList<String>();
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNextLine()) {
            String line = scanner.nextLine();
            String[] parts = line.split(";");
            if (parts.length > 1) {
                audition.addParticipant(parts[0], parts[1], parts[2],
                        Integer.parseInt(parts[3]));
            } else {
                cities.add(line);
            }
        }
        for (String city : cities) {
            System.out.printf("+++++ %s +++++\n", city);
            audition.listByCity(city);
        }
        scanner.close();
    }
}
class Participant {

    private String code;
    private String name;
    private int age;

    public Participant(String code, String name, int age) {
        super();
        this.code = code;
        this.name = name;
        this.age = age;
    }

    public String getCode() {
        return code;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }
    public String toString () {
        return code + " " + name + " " + age;
    }

}
class Audition {
    private Map <String,List<Participant>> participants;

    public Audition () {
        participants = new HashMap <> ();
    }
    public void addParticipant (String city, String code, String name, int age) {
        List <Participant> list = new LinkedList <> ();
        if(participants.containsKey(city)) {
            list = participants.get(city);
            for(Participant p : list) {
                if(p.getCode().equals(code))
                    return;
            }
            list.add(new Participant(code,name,age));
            participants.put(city,list);
        }
        else {
            list.add(new Participant(code,name,age));
            participants.put(city,list);
        }
    }
    public void listByCity (String city) {
        participants.get(city)
                    .stream()
                    .sorted(Comparator.comparing(Participant::getName)
                                      .thenComparing(Participant::getAge)
                                      .thenComparing(Participant::getCode))
                    .forEach(each -> System.out.println(each));
    }
}