Theses clone classes must have the same name than the Domain class (in a different package) and inherits from LazyGwtPojo.

这些克隆类必须使用和域类本身一样的名字（但两者在不同的包中），并且继承LazyGwtPojo。

youdao

Because clone has protected access in Object and, to call clone , you have to call it through a reference to a class that has overridden clone to be public.

因为clone在Object中是保护访问的，调用clone必须通过将clone改写公共访问的类引用来完成。

youdao

If a class contains only primitive fields or references to immutable objects, then it is usually the case that no fields in the object returned by super. clone need to be modified.

如果一个类只包含基本字段或对不变对象的引用，那么通常不需要修改super . clone返回的对象中的字段。

youdao