You have to do it like this:
import java.io.IOException;
class Student implements java.io.Serializable {
String name;
String DOB;
int id;
Student(String naam, int idno, String dob) {
name = naam;
id = idno;
DOB = dob;
}
private void writeObject(java.io.ObjectOutputStream stream)
throws IOException {
stream.writeObject(name);
stream.writeInt(id);
stream.writeObject(DOB);
}
private void readObject(java.io.ObjectInputStream stream)
throws IOException, ClassNotFoundException {
name = (String) stream.readObject();
id = stream.readInt();
DOB = (String) stream.readObject();
}
public String toString() {
return name + "\t" + id + "\t" + DOB + "\t";
}
}
The readObject is invoked just after creating an instance of Student (bypassing the normal constructor).