Externalization

If we want to write the readObject and writeObject as per our requirment we must implement our class by interface Externalizable .
for example if you want to sysout in readObject or in writeObject or any other changes then this is done by Externalizable interface which has two methods ,
1)readExternal(ObjectInput input).
2)writeExternal(ObjectOutput out).

Mangesh S.S.Wagahye,
Nagpur.