我想比较我的申请中的两个日期

第一个日期是今天的日期
第二个将来自数据库

为了保存第二个日期,我的代码如下: (使用明天的日期来保持简单)

 Calendar calendar = Calendar.getInstance();
 calendar.add(Calendar.DAY_OF_YEAR, 1);
 Date tomorrow = calendar.getTime();
 DateFormat dateFormat = new SimpleDateFormat("dd-MMM-yyyy");

 String tomorrowAsString = dateFormat.format(tomorrow);

所以tomorrowAsString (10-Oct-2015)存储在我数据库的一个表中

我以另一种形式检索该日期并将其放入字符串中
String steepingDate = (c.getString(3));

我想我需要将该字符串转换为日期格式,然后使用以下命令获取今天的日期;
Calendar calendar = Calendar.getInstance();
Date today = calendar.getTime();
DateFormat dateFormat = new SimpleDateFormat("dd-MMM-yyyy");

String todayAsString = dateFormat.format(today);

这是我卡住的地方,因为我不确定如何将steepingDate转换为Date,然后比较字符串的实际方法是什么,我尝试了在线查找,但是我有很多不同的方法尝试过,到目前为止都没有奏效。我想知道两者中哪一个是刨丝器

编辑:

我结合了一些答案,并提出以下建议;
do {
      String steepingDate = (c.getString(3));
      SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy");
      Date steepingdate = formatter.parse(steepingDate);

      Calendar calendar = Calendar.getInstance();
      Date today = calendar.getTime();

      if(today.compareTo(steepingdate)>0)
      {
         CompleteSteeping.add(c.getString(1));
      }
      i += 1;
   }while (c.moveToNext());

但是
SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy");
Date steepingdate = formatter.parse(steepingDate);

我收到一条错误消息:

'不可解析的日期:“java.util.GregorianCalender [time = 1444461352665,areFieldsSet = true,Ienient = true\zone = GMT,firstDayOfWeek = 1,minimalDaysInFirstWeek = 1,ERA = 1,YEAR = 2015,MONTH = 9,WEEK_OF_YEAR = 41 ,WEEK_OF_MONTH = 2,DAY_OF_MONTH = 10,DAY_OF_YEAR = 283,DAY_OF_WEEK = 7,DAY_OF_WEEK_IN_MONTH = 2,AM_PM = 0,HOUR = 7,HOUR_OF_DAY = 7,MINUTE = 15,SECOND = 52,MILLISECOND = 665,ZONE_OFFSET = 0 ]”(偏移量为0)

最佳答案

如果您只想比较字符串,则如下所示:

    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.DAY_OF_YEAR, 1);
    Date tomorrow = calendar.getTime();
    DateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy");

    String tomorrowAsString = dateFormat.format(tomorrow);

    calendar = Calendar.getInstance();
    Date today = calendar.getTime();

    String todayAsString = dateFormat.format(today);

    if(tomorrowAsString.equals(todayAsString))
        System.out.println(true);
    else
        System.out.println(false);

10-05 20:47
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