advantage of externalizable
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Posted By:   mandalika_prasad
Posted On:   Wednesday, April 26, 2006 12:25 AM

what is the use extenralizable and how it is used? explain with example?

Re: advantage of externalizable

Posted By:   vijay_chaudhary  
Posted On:   Tuesday, May 23, 2006 01:06 AM

Externalizable is used when we have to serialize a part of code bcoz when we use Serializable then whole class which is implementing Serializable interface will become serialized means data is converted to bitblob.

and suppose we have to compress data before serializing then we need Externalizable .
when we are implementing Externalizable then we have to override two methods: readExternal() , writeExternal();


public class ExternalizableDemo implements Externalizable {

public int lowBid = 0;

public String highBid = "";

public void writeExternal(ObjectOutput out)throws IOException{




public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException{

lowBid = in.readInt();

highBid = (String)in.readObject();


public String toString(){

return " "+lowBid+"high: "+highBid;


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