Classes Used in the Examples

package samples.spel.inventor;

import java.util.Date;
import java.util.GregorianCalendar;

public class Inventor {

  private String name;
  private String nationality;
  private String[] inventions;
  private Date birthdate;
  private PlaceOfBirth placeOfBirth;

  public Inventor(String name, String nationality) {
    GregorianCalendar c= new GregorianCalendar();
    this.name = name;
    this.nationality = nationality;
    this.birthdate = c.getTime();
  }

  public Inventor(String name, Date birthdate, String nationality) {
    this.name = name;
    this.nationality = nationality;
    this.birthdate = birthdate;
  }

  public Inventor() {
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getNationality() {
    return nationality;
  }

  public void setNationality(String nationality) {
    this.nationality = nationality;
  }

  public Date getBirthdate() {
    return birthdate;
  }

  public void setBirthdate(Date birthdate) {
    this.birthdate = birthdate;
  }

  public PlaceOfBirth getPlaceOfBirth() {
    return placeOfBirth;
  }

  public void setPlaceOfBirth(PlaceOfBirth placeOfBirth) {
    this.placeOfBirth = placeOfBirth;
  }

  public void setInventions(String[] inventions) {
    this.inventions = inventions;
  }

  public String[] getInventions() {
    return inventions;
  }
}

package samples.spel.inventor;

public class PlaceOfBirth {

  private String city;
  private String country;

  public PlaceOfBirth(String city) {
    this.city=city;
  }

  public PlaceOfBirth(String city, String country) {
    this(city);
    this.country = country;
  }

  public String getCity() {
    return city;
  }

  public void setCity(String s) {
    this.city = s;
  }

  public String getCountry() {
    return country;
  }

  public void setCountry(String country) {
    this.country = country;
  }
}

package samples.spel.inventor;

import java.util.*;

public class Society {

  private String name;

  public static String Advisors = "advisors";
  public static String President = "president";

  private List<Inventor> members = new ArrayList<>();
  private Map officers = new HashMap();

  public List getMembers() {
    return members;
  }

  public Map getOfficers() {
    return officers;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public boolean isMember(String name) {
    for (Inventor inventor : members) {
      if (inventor.getName().equals(name)) {
        return true;
      }
    }
    return false;
  }
}