Client.java

package agency;

import java.util.Objects;

public class Client {
  private final String firstName;
  private final String lastName;
  private final int yearOfBirth;
  public Client(String firstName, String lastName, int yearOfBirth) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.yearOfBirth = yearOfBirth;
  }

  public String getFirstName() {
    return firstName;
  }

  public String getLastName() {
    return lastName;
  }

  public int getYearOfBirth() {
    return yearOfBirth;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;

    Client client = (Client) o;

    if (yearOfBirth != client.yearOfBirth) return false;
    if (!Objects.equals(firstName, client.firstName)) return false;
    return Objects.equals(lastName, client.lastName);
  }

  @Override
  public int hashCode() {
    int result = firstName != null ? firstName.hashCode() : 0;
    result = 31 * result + (lastName != null ? lastName.hashCode() : 0);
    result = 31 * result + yearOfBirth;
    return result;
  }
}