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| java |
Expert:ravurivinodkumar
What is Externalization and how it can be implement in our application?
Can any one please explain me with some examples?
Thanks in advance
Vinod
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| Answers |
Hi friend...
Externalizable interface :
When user use Serializable interface, class is serialized by default but Externalizable interface
provides facility to complete control over serialization process so Externalization is a more advanced
alternative to serialization.
This interface has two methods:
1:- public void writeExternal(ObjectOutput out)
2:- public void readExternal(ObjectInput in)
Every class that usese/implements externalization must implement Externalizable interface and override these methods
and must have a no arguments constructor. These methods are automatically called at the time of serialization
and de-serialization so you can can implement your own serialization-specific operations and have control over what data
to serialize and wat to not.
Example Code :
import java.io.*;
public class MyExternObject implements Externalizable {
int i;
String s;
MyExternObject() {
i = 256;
s = new String("Implementation of interface Externalizable.");
}
public int getI() {
return i;
}
public String getS() {
return s;
}
public void writeExternal(ObjectOutput out) throws
IOException {
out.writeInt(this.i);
out.writeObject(this.s);
}
public void readExternal(ObjectInput in) throws
IOException, ClassNotFoundException {
this.i = in.readInt();
this.s = (String) in.readObject();
}
public static void main(String[] args) throws
IOException, ClassNotFoundException {
MyExternObject externObject = new MyExternObject();
System.out.println(externObject.getS());
System.out.println(externObject.getI());
}
}
Output :
Implementation of interface Externalizable.
256
Thanks..
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