customer.java

@Entity
public class Customer {

  @Id
  @GeneratedValue(strategy=GenerationType.AUTO)
  private Long id;
  private String firstName;
  private String lastName;
  @Unique
  private String identityNumber;
  private Calendar birthDate;
  
  protected Customer() {}

  public Customer(String firstName, String lastName, String identityNumber, Calendar birthDate) {
    this.firstName = firstName;
    this.lastName = lastName;
    this.identityNumber = identityNumber;
    this.birthDate = birthDate;
  }

  @Override
  public String toString() {
    return String.format(
        "Customer[id=%d, firstName='%s', lastName='%s']",
        id, firstName, lastName);
  }

  public Long getId() {
    return id;
  }

  public String getFirstName() {
    return firstName;
  }

  public String getLastName() {
    return lastName;
  }
  public String getIdentificationNumber() {
    return identificationNumber;
  }
  public Calendar getBirthDate() {
    return birthDate;
  }
}