JAVA优化连续天数日期的展示

入参： String d1 = “2018-7-22”; String d2 = “2018-7-23”; String d3 = “2018-7-24”; String d4 = “2018-7-25”; String d5 = “2018-7-27”; 需求:连续的日期需要展示成：

2018-07-22~2018-07-25

,2018-07-27.

public class Util {

   private static int supplierID = 16551;
   private static String Key = "209903b0-5f92-4759-9ea9-8723124f8c9e";

   public static void main(String[] args) throws ParseException {

      String d1 = "2018-7-22";
      String d2 = "2018-7-23";
      String d3 = "2018-7-24";
      String d4 = "2018-7-25";
      String d5 = "2018-7-27";
      List list = new ArrayList();
      list.add( new SimpleDateFormat("yyyy-MM-dd").parse(d1));
      list.add( new SimpleDateFormat("yyyy-MM-dd").parse(d2));
      list.add( new SimpleDateFormat("yyyy-MM-dd").parse(d3));
      list.add( new SimpleDateFormat("yyyy-MM-dd").parse(d4));
      list.add( new SimpleDateFormat("yyyy-MM-dd").parse(d5));
      System.out.println("formDate "+betterSyncTime(list));

   }


   /**
    * @Author Linliang
    * @Description 优化连续日期的显示
    * @Date 2018/7/19
    * @Param
    */
   static String betterSyncTime(List<Date> list) {
      Date sDate = null;
      Date eDate = null;
      boolean isStart = true;
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
      StringBuilder sb = new StringBuilder();
      for (int i = 0; i < list.size() - 1; i++) {
         if (differentDays(list.get(i), list.get(i+1)) == 1) {
            if (isStart != false) {
               sDate = list.get(i);
               isStart = false;
            }
            if(i == (list.size()-2)){
               eDate = list.get(i+1);
               sb.append(sdf.format(sDate)).append("~").append(sdf.format(eDate)).append(".");
            }
         } else {
            if (isStart != true ) {
               eDate = list.get(i);
               sb.append(sdf.format(sDate)).append("~").append(sdf.format(eDate)).append(",");
               isStart = true;
            } else {
               sb.append(sdf.format(list.get(i))).append(",");
            }
            if(i == (list.size()-2)) {
               sb.append(sdf.format(list.get(i+1))).append(".");
            }
         }
      }
      return sb.toString();
   }


   /**
    * @Author Linliang
    * @Description  计算两个日期相差几天
    * @Date  2018/7/19
    * @Param
   */
   public static int differentDays(Date date1, Date date2) {
      Calendar cal1 = Calendar.getInstance();
      cal1.setTime(date1);
      Calendar cal2 = Calendar.getInstance();
      cal2.setTime(date2);
      int day1 = cal1.get(Calendar.DAY_OF_YEAR);
      int day2 = cal2.get(Calendar.DAY_OF_YEAR);
      int year1 = cal1.get(Calendar.YEAR);
      int year2 = cal2.get(Calendar.YEAR);
      if (year1 != year2)   //同一年
      {
         int timeDistance = 0;
         for (int i = year1; i < year2; i++) {
            if (i % 4 == 0 &amp;&amp; i % 100 != 0 || i % 400 == 0)   //闰年
            {
               timeDistance += 366;
            } else   //不是闰年
            {
               timeDistance += 365;
            }
         }

         return timeDistance + (day2 - day1);
      } else   //不同年
      {
         return day2 - day1;
      }
   }
}

原文地址：https://blog.csdn.net/victoylin/article/details/81114410?ops_request_misc=&request_id=1dc8ed900c9e4624a6d881ce17781e11&biz_id=&utm_medium=distribute.pc_search_result.none-task-blog-2~all~koosearch~default-10-81114410-null-null.142^v88^insert_down28v1,239^v2^insert_chatgpt&utm_term=java%E4%BC%98%E5%8C%96