Serialization without writing it in a file

Question

I need to serialize array of object. I can't use the file to store my serialized objects. I am trying to use ByteArrayOutputStream() for this purpose.
I have the follwoing doubts:
1) Can i write the array object as a one object or do i need to write evey object inside the array object seprately as out.writeObject(objectSerilized)?
2) I got a sample code to write one object as follows:
public static void main(String[] args) throws Exception {
          //Serialization
          SerializableClass serl = new SerializableClass();
          ByteArrayOutputStream bos = new ByteArrayOutputStream();
          ObjectOutputStream out = new ObjectOutputStream(bos);
          out.writeObject(serl);
          //De-serialization
          ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
          ObjectInputStream in = new ObjectInputStream(bis);
          SerializableClass in_serl = (SerializableClass) in.readObject();
          System.out.println(in_serl.getName());
But, doesn't this also means that I will need to serialize and de-serialize the object within the boundary of a single class. Because once the main method of the above class end, the object bos cease to exist. I need to excess theis array of objects from more then one class. How can i do it?
Thanks

Answer 1

For the second part " need to excess theis array of objects from more then one class. How can i do it?" . I think i can just make the ByteArrayOutputStream bos = new ByteArrayOutputStream(); object public so that will be accessible.
But i still don't know how to write a array of objects...