计算两个 Java 日期实例之间的差异 [英] Calculating the difference between two Java date instances

问题描述

我在 Scala 中使用 Java 的 java.util.Date 类，想要比较 Date 对象和当前时间.我知道我可以使用 getTime() 计算增量:

I'm using Java's java.util.Date class in Scala and want to compare a Date object and the current time. I know I can calculate the delta by using getTime():

(new java.util.Date()).getTime() - oldDate.getTime()

然而，这给我留下了一个 long 代表毫秒.有没有更简单、更好的方法来获得时间增量?

However, this just leaves me with a long representing milliseconds. Is there any simpler, nicer way to get a time delta?

推荐答案

不幸的是，JDK Date API 严重损坏.我建议使用 Joda 时间库.

The JDK Date API is horribly broken unfortunately. I recommend using Joda Time library.

Joda Time 有一个时间概念间隔:

Joda Time has a concept of time Interval:

Interval interval = new Interval(oldTime, new Instant());

顺便说一句，Joda 有两个概念:Interval 表示两个时间瞬间之间的时间间隔(表示上午 8 点到 10 点之间的时间)，以及 Duration> 表示没有实际时间界限的时间长度(例如表示两个小时！)

By the way, Joda has two concepts: Interval for representing an interval of time between two time instants (represent time between 8am and 10am), and a Duration that represents a length of time without the actual time boundaries (e.g. represent two hours!)

如果您只关心时间比较，大多数 Date 实现(包括 JDK 的实现)都实现了 Comparable 接口，该接口允许您使用 Comparable.compareTo()

If you only care about time comparisions, most Date implementations (including the JDK one) implements Comparable interface which allows you to use the Comparable.compareTo()

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