serializaton??

[kesava chaitanya]

wat is serialization;wat is'the use of this in java ;give me one good example??

regds
chaitu

[William Barnes]

We all know the Java platform allows us to create reusable objects in memory. However, all of those objects exist only as long as the Java virtual machine1 remains running. It would be nice if the objects we create could exist beyond the lifetime of the virtual machine, wouldn't it? Well, with object serialization, you can flatten your objects and reuse them in powerful ways.
Object serialization is the process of saving an object's state to a sequence of bytes, as well as the process of rebuilding those bytes into a live object at some future time.

[David Weitzman]

Sortof like a psuedo-example (catch your own IOExceptions):

// user, bob, and item all implement java.io.Serializable
// see bob
User bob = new User("bob");
// bob sees jdk
Item jdk = new Item("JDK 1.4", 3.95);
// bob order's jdk
Order order = new Order(bob, jdk);
// cheap bastards don't have a real database
// the use a network filesystem instead.
java.io.OutputStream out = new java.io.FileOutputStream("queue.ser", true);
java.io.ObjectOutputStream oout = new java.io.OutputOutputStream(out);
oout.writeObject(order);

// ... meanwhile, on the operations side of the buisness
// a never ending loop
ObjectInputStream in = new ObjectInputStream(fileStream);
while (true) {
  while (!in.available()) {
    try {
      Thread.sleep(200);
    } catch (InterruptedException) {
    }
  }
  // this is not thread safe by the way
  Order o = (Order) (in.readObject());
  System.out.println(o.getUser().getName() + " wants a " + o.getItem().getName());
  System.out.println("We don't have a address or phone number.");
  System.out.println("Or a last name.");
  System.out.println("Now get moving.");
}