java - 两个日期之间的天数

Question

出于某种原因，输出的数值约为 16348。当第一个和最后一个日期值分别为 0110 和 0201 时。为什么我没有获得每日值(value)？

import java.util.Scanner;
import java.util.Calendar;
import java.util.Date;
import java.text.SimpleDateFormat;

public class Project3 {

  public static void main(String[] args) {
  Scanner input = new Scanner(System.in);

  String firstDate = input.next(), lastDate = input.next();

  try {
    Date date1 = new SimpleDateFormat("MMdd").parse(firstDate);
    Date date2 = new SimpleDateFormat("MMdd").parse(lastDate); 
    System.out.println(Project3.days(date1, date2));     
  } catch (Exception e) {
    //
  } 

  }
   public static long days(Date startDate, Date endDate) {
    Calendar start = Calendar.getInstance();
    start.setTime(startDate);
    Calendar end = Calendar.getInstance();
    long daysBetween = 0;
    while(start.before(end)) {
        start.add(Calendar.DAY_OF_MONTH, 1);
        daysBetween++;
    }
    return daysBetween;
 }
}

Answer 1

您忘记调用Calendar.setTime(Date)在结束，

Calendar end = Calendar.getInstance();
end.setTime(endDate); // <-- like so.