So if you serialize one singleton twice, the two serialized objects take on separate identities.
所以如果两次序列化一个单例对象，这两个序列化得到的对象会持有两个不同的标识。
The design of this class ensures that only one Singleton object is ever created.
此类的设计确保只创建一个Singleton对象。
The design of this class ensures that only one Singleton object is ever created.
此类的设计确保只创建一个Singleton对象。
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