XMLGregorianCalendar objects are mutable, and therefore you can simply set any of the date or time fields directly on the object.
XMLGregorianCalendar对象是可以修改的，因此能够直接设置对象的日期或时间字段。
Lists, specifically, are handy mutable objects that can conveniently even hold multiple values.
明确的讲，列表是一些便利的可变对象，他们甚至可以方便地保留多个值。
Some design problems are easier to solve with mutable objects.
有一些设计问题还是使用易变对象比较容易解决。
There are some other issues such as small mutable object creation, such as Rectangle, Point etc, these objects usually cannot be re-used due to synchronization consideration.
一些其他的问题来源于小的可变对象的创建，如Rectangle,Point，这些对象基于同步的考虑通常不可重用。
There are some other issues such as small mutable object creation, such as Rectangle, Point etc, these objects usually cannot be re-used due to synchronization consideration.
一些其他的问题来源于小的可变对象的创建，如Rectangle,Point，这些对象基于同步的考虑通常不可重用。
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