| Package | Description | 
|---|---|
| java.io | Provides for system input and output through data streams,
serialization and the file system. | 
| Modifier and Type | Field and Description | 
|---|---|
| static SerializablePermission | ObjectStreamConstants. SUBCLASS_IMPLEMENTATION_PERMISSIONEnable overriding of readObject and writeObject. | 
| static SerializablePermission | ObjectStreamConstants. SUBSTITUTION_PERMISSIONEnable substitution of one object for another during
 serialization/deserialization. | 
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