我应该使用Calendar.compareTo（）来比较日期吗？ [英] Should I use Calendar.compareTo() to compare dates?

问题描述

这是比较日期的有效方法：

Is it a valid way of comparing dates:

Calendar someCalendar1 = Calendar.getInstance(); // current date/time
someCalendar1.add(Calendar.DATE, -14);

Calendar someCalendar2 = Calendar.getInstance();
someCalendar2.setTime(someDate); // someDate is in the format of MM/dd/yyyy

if(someCalendar2.compareTo(someCalendar1) < 0){
   ...Code...               
}

...还是有更好的方法？

...or is there a better approach?

推荐答案

Date 实现了可比性，所以没有理由将其包装到日历中：

Date implements comparable itself so there's no reason to wrap it into calendar:

Calendar someCalendar1 = Calendar.getInstance(); // current date/time
someCalendar1.add(Calendar.DATE, -14);

if (someDate.compareTo(someCalendar1.getTime()) < 0) {
   ...Code...                           
}

日期也很方便 after（）和 before（）方法使上述比较更容易阅读：

Date also has convenient after() and before() methods that make the above comparison easier to read:

if (someDate.before(someCalendar1.getTime())) {
   ...Code...                           
}

最后，如果您处理日期/时间很多，请考虑使用 Joda Time ，而不是内置的java类。它更加方便和功能：

Finally, if you're dealing with date / time a lot, do consider using Joda Time instead of built-in java classes. It's MUCH more convenient and functional:

DateTime dt = new DateTime().minusWeeks(2);
if (new DateTime(someDate).isBefore(dt)) {
   ...Code...                           
}

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