java - 如何只比较 java.sql.TimeStamp 的时间

Question

public long compareTwoTimeStamps(Timestamp currentTime, Timestamp oldTime) 
{
  long milliseconds1 = oldTime.getTime();
  long milliseconds2 = currentTime.getTime();
  long diff = milliseconds2 - milliseconds1;
  long diffMinutes = diff / (60 * 1000);
  return diffMinutes;
}

上面的代码也考虑了日期。我需要比较 Timestamp 的 2 个实例，并且只比较 Timestamp 的时间部分。不应考虑日期。每当我比较它时，比较也会考虑日期。

Answer 1

一种解决方案，使用 getHours , getMinutes关于时间戳:

public long compareTwoTimeStamps(java.sql.Timestamp currentTime, java.sql.Timestamp oldTime) 
{
    long min1 = oldTime.getHours() * 60 + oldTime.getMinutes();
    long min2 = currentTime.getHours() * 60 + currentTime.getMinutes();
    return min2 - min1;
}

或者没有任何弃用的方法:

public long compareTwoTimeStamps(java.sql.Timestamp currentTime, java.sql.Timestamp oldTime)
{
    final Calendar oldCal = Calendar.getInstance();
    oldCal.setTime(oldTime);
    long min1 = oldCal.get(Calendar.HOUR) * 60 + oldCal.get(Calendar.MINUTE);
    final Calendar currentCal = Calendar.getInstance();
    currentCal.setTime(currentTime);
    long min2 = currentCal.get(Calendar.HOUR) * 60 + currentCal.get(Calendar.MINUTE);
    return min2 - min1;
}