Почему валидатор не пропускает по последнему пункту?
package com.javarush.task.task19.task1904;
import java.util.Date;
public class Person {
private String firstName;
private String middleName;
private String lastName;
private Date birthDate;
public Person(String firstName, String middleName, String lastName, Date birthDate) {
this.firstName = firstName;
this.middleName = middleName;
this.lastName = lastName;
this.birthDate = birthDate;
}
@Override
public String toString() {
return String.format("%s %s %s %s", lastName, firstName, middleName, birthDate.toString());
}
}