从今天的日期减去设定日期

Question

我试图从另一年的另一个日期中减去今天的日期。我似乎无法在设定的日期同时更改年份和日期，我需要计算多少天。

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

public class Wateber {

  public static void main(String args[]) {
     int summer = 2016;
    Calendar calendar1 = Calendar.getInstance();
    int currentDayOfYear = calendar1.get(Calendar.DAY_OF_YEAR);

    int year = calendar1.get(Calendar.YEAR);

    Calendar calendar2 = new GregorianCalendar(year, 6, 10);
    int dayJune10 = calendar2.get(Calendar.DAY_OF_YEAR);

    int remainingdays = 0;
    if (summer == 2016)
    {
        remainingdays = calendar2 - currentDayOfYear;
    }

    System.out.println(remainingdays + " days until summer");

        }
}