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<H1>Serializable</H1>
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<LI> Ability to save a java object to a stream
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<LI> Implementing Serializable enables serialization.
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<LI> No methods or fields, just a semantic construct - tag.
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<LI> NotSerializable Exception is thrown if the object graph
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has any non serializable objects - transient modifier
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<LI> Can all classes be serialized?
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<LI>
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private void writeObject(java.io.ObjectOutputStream out)
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throws IOException
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private void readObject(java.io.ObjectInputStream in)
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throws IOException, ClassNotFoundException;
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