EJB pattern Help!

Question

Hi
guys!
I am newbie to EJB,A question puzzled me much these days.Help me plz :)
I know the EJB include three objects:EJBObject,EJBHome and XXXBean,The EJBHome object create EJBObjects by Facatory pattern.But,The EJBHome is an Interface,so does its subclass,How can an interface use create() method creating an EJBHome Object?
I don't know wthere I describe the question clearly .example as follws:
   public interface Converter extends EJBObject{
         public bussinessMethod1();
public interface ConverterHome extends EJBHome{
       Converter create() .....;
//Client
  Converter currencyConverter=home.create();//<===
   //I can't understand it!home is an interface,and it isn't implemented(or only because i do not find out it )
  the same question occered when I use the Serilizable interface,a class implement theSerilizable interface,then it is serilizable,too.but in the Serilizable interface,i can't find any clue How the serilizable works.
It maybe a stupid question,but ,Help me PLZ!
Thanx for your time!
kind regards
elant

Answer 1

First, a typical EJB is made up of a HOME, REMOTE and a BEAN. You are correct, your HOME and REMOTE are interfaces. The BEAN is your implementation class.
Converter currencyConverter=home.create();//<===
//I can't understand it!home is an interface,and it
isn't implemented(or only because i do not find out itWhat happens here is your application server will generate a subclass of your HOME interface and implete the create method. That method will, among other things, call the ejbCreate() on your BEAN.
the same question occered when I use the Serilizable
interface,a class implement theSerilizable
interface,then it is serilizable,too.but in the
Serilizable interface,i can't find any clue How the
serilizable works.To begin understanding the Serializable interface, take a look at the javadoc found at http://java.sun.com/j2se/1.4.2/docs/api/java/io/Serializable.html You may also wish to look for the tutorials found on the java.sun.com website.
Hope this helps.