public class Person {
  public final String name;
  public final int age;
  public final String city;

  public Person(String name, int age, String city) {
    this.name = name;
    this.age = age;
    this.city = city;
  }

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

    Person person = (Person) o;

    if (age != person.age) return false;
    if (name != null ? !name.equals(person.name) : person.name != null) return false;
    return city != null ? city.equals(person.city) : person.city == null;
  }

  @Override
  public int hashCode() {
    int result = name != null ? name.hashCode() : 0;
    result = 31 * result + age;
    result = 31 * result + (city != null ? city.hashCode() : 0);
    return result;
  }

  @Override
  public String toString() {
    return "Person{" +
    "name='" + name + '\'' +
    ", age=" + age +
    ", city='" + city + '\'' +
    '}';
  }
}