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reading an writting Serializable file

 
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This is my code for writing the file


This is the error it is giving me an i have no clue what the problem is



I have no clue what these are talking about. Any help would be great i am only posting the writing the file first then ill test it an then post the reading error.
 
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Not all classes are serializable. Is Stock a class you wrote? If so, you can add serialization support to your class.

See this tutorial for more info.
 
Consider Paul's rocket mass heater.
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