Java Data Type - 如何get两个LocalDate之间的Period

import java.time.LocalDate;
import java.time.Period;

public class Main {
  public static void main(String[] args) {

    LocalDate firstDate = LocalDate.of(2013, 5, 17); 
    LocalDate secondDate = LocalDate.of(2015, 3, 7); 
    Period period = Period.between(firstDate, secondDate);

    System.out.println(period);
  }
}