Externalizable.readExternal
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public abstract void readExternal( ObjectInput in ) throws IOException, ClassNotFoundException
Description
The object implements the readExternal method to restore its
contents by calling the methods of DataInput for primitive
types and readObject for objects, strings and arrays. The
readExternal method must read the values in the same sequence
and with the same types as were written by writeExternal.
Exceptions
ClassNotFoundException
If the class for an object being
restored cannot be found.