package facebook;
public class PersonExistsException extends Exception {
}
package facebook;
public class NoSuchCodeException extends Exception {
}
import java.util.Collection;
import java.util.HashSet;

public class Person {
    String name;
    String surname;
    String code;
    HashSet<String> friends = new HashSet<String>();
    HashSet<String> groups = new HashSet<String>();

    public Person(String code2, String name2, String surname2) {
        code = code2;
        name = name2;
        surname = surname2;
    }

    public void addFriend(String code) {
        friends.add(code);
    }

    public String getName() {
        return name;
    }

    public String getSurname() {
        return surname;
    }

    public String getCode() {
        return code;
    }

    public String toString() {
        return code + " " + name + " " + surname;
    }

    public Collection<String> getFriends() {
        return friends;
    }

    public void addGroup(String groupName) {
        groups.add(groupName);
    }

    public Collection<String> getGroups() {
        return groups;
    }
}
package facebook;

import java.util.Collection;
import java.util.HashSet;

public class Group {

    String name;
    HashSet<String> members = new HashSet<String>();

    public Group(String groupName) {
    name = groupName;
    }

    public void addPerson(String codePerson) {
        members.add(codePerson);
    }

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

    public String getName() {
        return name;
    }
}