Serialization is the process of converting a set of object instances that contain references to each other into a linear stream of bytes,
which can then be sent through a socket, stored to a file, or simply manipulated as a stream of data. Serialization is the mechanism used by
Objects would be passed between JVMs, either as arguments in a method invocation from a client to a server or as return values from a method invocation.

The object which is to be serialzed should implement "Serializable" interface.

 class PersonDetails implements Serializable
 
We use ObjectOutputStream to Serialize the Objects,  please take a look at colored code snippet below.

   FileOutputStream fos = null;
  ObjectOutputStream out = null;
  try {
   fos = new FileOutputStream(filename);
   out = new ObjectOutputStream(fos);
   out.writeObject(list);
   out.close();
   System.out.println("Object Persisted");
  } catch (IOException ex) {
   ex.printStackTrace();
  }

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