java 如何在变量中存储时间？
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How do I store time in a variable?
提问by DSF
One of my classes Eventwill have an instance field which is called timeStamp. Now, I have another class which will set the timeStampaccording to some other algorithm which is not really relevant here.
我的一个类Event将有一个实例字段，称为timeStamp. 现在，我有另一个类，它将timeStamp根据一些其他的算法来设置，这在这里并不真正相关。
My question is what typeshould I store this timeStampin? From what I've researched so far I have the impression that it should be calculated in milliseconds and thus store it in a doubleperhaps.
我的问题是我应该将它存储在什么类型timeStamp中？从我到目前为止的研究来看，我的印象是它应该以毫秒为单位计算，因此将它存储在一个double可能的。
Basically the Clockclass I have simulates time in the following format : hh:mm:ss. However, since it's a discrete event simulation that I'm developing it jumps from event to event, which it determines by timeStampvalue i.e. each event object has a timeStampvalue which is stored in a PrioityQueue. So I thought about storing the timeStampin the same format as the Clock, which I guess would involve me creating a new class TimeStampthat then becomes the type of the timestamp. Or should I just make the clock simulate time in milliseconds?
基本上，Clock我的课程以以下格式模拟时间：hh:mm:ss。然而，由于我正在开发它是一个离散事件模拟，它从一个事件跳到另一个事件，它由timeStamp值决定，即每个事件对象都有一个timeStamp存储在PrioityQueue. 因此，我认为有关存储timeStamp在相同的格式Clock，我猜会涉及我创建一个新类TimeStamp是则成为的类型timestamp。或者我应该让时钟以毫秒为单位模拟时间？
What are your thoughts on this? I'm not sure on the most efficient/clean way to implement this.
你对此有何看法？我不确定实现这一点的最有效/最干净的方法。
采纳答案by jahroy
When a date is stored as milliseconds since the epoch, you should use a long.
当日期存储为自纪元以来的毫秒数时，您应该使用long.
There's no need for a double, since you're not interested in fractions of a millisecond.
不需要 a double，因为您对几分之一毫秒不感兴趣。
You can't use an intbecause the maximum int value is only large enough to represent approximately one month in millis.
您不能使用 an，int因为最大 int 值仅足以表示大约一个月的毫秒数。
You can get such a value like this:
你可以得到这样的值：
long millisSinceEpoch = Calendar.getInstance().getTimeInMillis();
long millisSinceEpoch = Calendar.getInstance().getTimeInMillis();
回答by Robert Harvey
Store the milliseconds in a long.
将毫秒存储在long.
You can use the DateTimeclass in Joda Time to perform all sorts of intricacies on the resulting number. This overloadallows you to plug the milliseconds value directly into a DateTimeobject.
您可以使用DateTimeJoda Time 中的类对结果数字执行各种复杂的操作。 此重载允许您将毫秒值直接插入DateTime对象中。
