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This interface defines the methods
that must be implemented by an object that wants complete control
over the way it is
serialized. The
writeExternal( )
and readExternal(
) methods should be implemented to write and read object
data in some arbitrary format, using the methods of the
DataOutput and DataInput
interfaces. Externalizable objects must serialize
their own fields and are also responsible for serializing the fields
of their superclasses. Most objects do not need to define a custom
output format and can use the Serializable
interface instead of Externalizable for
serialization.
Figure 9-13. java.io.Externalizable
public interface Externalizable extends Serializable {
// Public Instance Methods
void readExternal (ObjectInput in ) throws IOException, ClassNotFoundException;
void writeExternal (ObjectOutput out ) throws IOException;
}