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ObjectInputStream and ObjectOutputStream allows you to read and write objects from any class (not just primitive types).
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Java objects are serialized with writeObject() and deserialized with readObject(). For example:
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Vector lines = new Vector( 256 ); ...
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try {
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new ObjectOutputStream(
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new GZIPOutputStream(
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new FileOutputStream( filename ) ) );
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out.writeObject( lines );
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out.close();
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} catch ( IOException e ) { }
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Only objects of classes that implement Serializable (or Externalizable) can be serialized. (The Serializable interface defines no methods.)
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Object variables not to be serialized are called transient.
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