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Why is it necessary to use the marker interface to serialize an object?

Why can't I avoid this if I want all the objects in my application to be serialized?

Update: I know that some class cannot be serialized as a stream, but the java system also knows that Thread is not serializable, why doesn't it automatically control it?

I would like to know if there are fundamental reasons.

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Why can't I avoid this if I want all the objects in my application to be serialized?

Just because Java serialization works this way.

Note that serializing all objects does not make sense.

  • Threadinstances and instances of most classes Streaminclude a critical state that simply cannot be serialized.
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Source: https://habr.com/ru/post/1772245/

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