For example, invoking the addAll(Collection) method on an unmodifiable collection may, but is not required to, throw the exception if the collection to be added is empty.
如对于一个不可更新 集合调用addAll(Collection),而如果要被添加集合是空,可抛出该异常,但不是必须。
For example, invoking the addAll(Collection) method on an unmodifiable collection may, but is not required to, throw the exception if the collection to be added is empty.
如对于一个不可更新 集合调用addAll(Collection),而如果要被添加集合是空,可抛出该异常,但不是必须。
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