Whats the meaning of the term Serialized.

Question

Hi All,
1.         I am creating Data Transfer Object class to access data in EJB project.
Serializable is an Interface and implementing in DTO class. Whats the definite advantage of implementing this interface and Why.
2. Whats the difference between Long n long data type.
Cheers,
Senthil

Answer 1

Hi! Sam,
  sorry i forget to answer your second question i.e Diff b/w long and Long.
See, in Java for ever kind of variable like int, long,string there are two kinds of DataType.one is called primitive type(int, long,string) and one is called classType(Integer,Long,String).
you can convert one type to other.ClassType(like Long) is nothing but a wrapper in primitive dataType(like long).If you talk abt the value of both the dataType then the value of both the dataType will be same.
The advantage of classType variable is, they will give you some added methods which is not available in primitive type and if you wanted to deal with collection API(linkList,ArrayList) then you need classType variable.
Java is not a pure Object Oriented Language,one of the reason of this is primitive TypeData because those are not class Object.
Example:--
   string str = "Hi";
   String strObj = New String("Hi");
For more clarification please refer any Java Book.
regards,
Mithilehwar