我如何比較Java中Date的時間部分

Question

我需要比較 2 個日期/時間變量的時間部分，以查看時間是否介於 android 中的當前時間之間。 我怎樣才能做到這一點？

    Boolean InBetweenTime(Date currentTime, Date StartTime, Date EndTime)
{
    Boolean result = false;
    Calendar calendar = Calendar.getInstance();
    if ((!currentTime.before(StartTime))&&(!currentTime.after(EndTime))){
        //between time
    } else {
        //not inbetween time
    }
    return result;
}

Answer 1

如果您只需要比較時間而忽略日期，那么您應該這樣做，這樣您的“日期”部分在所有三個變量中都相等。

Boolean InBetweenTime(Date currentTime, Date startTime, Date endTime){
    Boolean result = false;

    //calendar for currentTime
    Calendar currentCal = Calendar.getInstance();
    currentCal.setTime(currentTime);
    //calendar for startTime
    Calendar startCal = Calendar.getInstance();
    startCal.setTime(startTime);
    //calendar for endTime
    Calendar endCal = Calendar.getInstance();
    endCal.setTime(endTime);
    //set corresponding date fields of startTime and endTime to be equal t ocurrentTime, so you compare only time fields
    startCal.set(currentCal.get(Calendar.YEAR), currentCal.get(Calendar.MONTH), currentCal.get(Calendar.DAY_OF_MONTH));
    endCal.set(currentCal.get(Calendar.YEAR), currentCal.get(Calendar.MONTH), currentCal.get(Calendar.DAY_OF_MONTH));
    //return true if between, false otherwise
    return (!currentTime.before(startCal.getTime())) && (!currentTime.after(endCal.getTime()));
}