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advantage of serialization over i/o classes

 
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what's the problem in i/o classes to save the state of object.what's the advantage of Serialization over i/o classes.

 
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I don't understand the question. Serialization uses I/O classes. Why do you think there's a problem or an advantage or a "one vs. the other" situation?
 
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serialization performs deep copy by default. if you wish to go with your own then you need to take care all of this.
 
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But serialisation can impose a severe performance overhead on copying objects.
You ought not to think about serialisation versus I/O. Serialisation is one way to make an object suitable for I/O.
 
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