Java: Serializare

//Clasa care urmeaza a fi serializata

import java.util.*;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.io.*;

public class ClasaSpreSerializare implements Serializable{
 private int campPrivat;
 protected int campProtejat;
 public int campPublic;
 private static int campStatic;
 protected transient int campTransient;
 public ClasaSpreSerializare(){}
 public ClasaSpreSerializare(int x,int y,int z, int a, int b){
  campPrivat=x;
  campProtejat=y;
  campPublic=z;
  campStatic=a;
  campTransient=b;
 }
 public String toString(){
  return "campPrivat: "+campPrivat+" campProtejat: "+campProtejat+" campPublic: "+campPublic+" campStatic: "+campStatic+" campTransient: "+campTransient;
 }
 public void writeObject(ObjectOutputStream obj)throws Exception{
  obj.writeInt(campProtejat);
 }
 public void readObject(ObjectInputStream obj2)throws Exception{
  campTransient=obj2.readInt();
 }
}

//Clasa de test

import java.util.*;
import java.io.*;

public class TestClasa {
 public static void main(String[] args){
 ClasaSpreSerializare test1=new ClasaSpreSerializare(1,2,3,4,5);
 System.out.println("Continutul obiectului inainte de serializare: "+test1.toString());
 
 try{
  ObjectOutputStream obj=new ObjectOutputStream(new FileOutputStream("fis.txt"));
  obj.writeObject(test1);
  test1.writeObject(obj);
  obj.close();
 }catch(Exception ex){
  System.out.println("Eroare la scriere!!!");
 }
 
 try{
  ObjectInputStream obj=new ObjectInputStream(new FileInputStream("fis.txt"));
  ClasaSpreSerializare test2=(ClasaSpreSerializare)obj.readObject();
  test2.readObject(obj);
  System.out.println("Obiectul dupa deserializare: "+test2.toString());
 }catch(Exception ex){
  System.out.println("Eroare la citire");
 }
 }
}
 

/**Metode de serializare:
1. Extinderea unei clasa serializabile
2. Implementare Serializable
3. Metode de serializare obisnuite(vezi writeObject(ObjectOutputStream obj) din exemplu; (se poate folosi pt transmiterea unor campuri, de ex transient)
4. Implementare Externalizable(tot o interfata marker), asemanator cu metoda descrisa mai sus la 3., folosesc flux pe Object
5. Declarare interfata si metode aferente(cel mai general), metodele folosesc fluxuri DataOutputStream
Vezi: Java de la 0 la expert
*/