我正在尝试制作一个对象的深层副本,包括一个 GregorianCalendar
实例.我总是对使用 clone()
持谨慎态度,而且这里似乎没有被覆盖,所以我只是逐个字段地进行复制.理想情况下,会有一个复制构造函数,我可以像这样使用它:
I'm trying to make a deep copy of an object, including a GregorianCalendar
instance. I'm always wary of using clone()
and it doesn't seem to have been overridden here, so I'm just doing the copy field by field. Ideally, there'd be a copy constructor, which I could use like so:
GregorianCalendar newCalendar = new GregorianCalendar(oldCalendar);
不幸的是,我在 API 中找不到任何此类功能,并且一直在试图找出我需要哪些字段才能获得准确的副本.那么,要复制其中一个日历,你会怎么做呢?我在这里错过了一些简单的快捷方式吗?
Unfortunately I can't find any such functionality in the API and am stuck trying to figure out which fields I need to get an exact copy. So, to make a copy of one of these calendars, how would you do it? Am I missing some simple shortcut here?
java.util.Calendar
已经覆盖了正在工作的 clone()
,所以使用它.此外,Calendar
没有很深的数据层次——它的数据主要是 int
s.
java.util.Calendar
has overridden clone()
which is working, so use it. Furthermore, Calendar
doesn't have a deep data hierarchy — its data are mainly int
s.
要扩展答案,您可以调用 SerializationUtils.clone(...)
(来自 Apache commons-lang)在任何进行深拷贝的对象上,如果整个数据层次结构实现 Serializable
.
To extend the answer, you can call SerializationUtils.clone(…)
(from Apache commons-lang) on any object which makes a deep copy, if the whole data hierarchy implements Serializable
.
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