我应该使用Calendar.compareTo()来比较日期吗? [英] Should I use Calendar.compareTo() to compare dates?
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问题描述
这是比较日期的有效方式:
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 实现类似的本身,因此没有理由将它包装到日历中:
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,如果你经常处理日期/时间,请考虑使用 Joda Time 而不是内置的java类。它更方便和功能更多:
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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