Java Data Type - 如何确定给定日期前一天的日期

import static java.util.Calendar.DAY_OF_MONTH;
import static java.util.Calendar.MARCH;
import static java.util.Calendar.MONTH;
import static java.util.Calendar.YEAR;

import java.util.Calendar;
import java.util.GregorianCalendar;

public class Main {

  public static void main(String... args) {
    Calendar calendar = GregorianCalendar.getInstance();
    calendar.set(YEAR, 2015);
    calendar.set(MONTH, MARCH);
    calendar.set(DAY_OF_MONTH, 1);
    System.out.println(calendar.getTime());
    calendar.add(DAY_OF_MONTH, -1);
    System.out.println(calendar.getTime());

  }
}