A thought about dynamic Class handling

Question

I've been musing on the management of, particularly, dynamically loaded classes and I've come up with an interesting idea which I thought I'd toss arround.
What I felt was wanted was a kind of template which created a contract for the static elements of a class (static methods and constructors) in the same way an interface serves for an instance of a class. At first I thought this would require an extension to the language, but I've come up with a way of doing it with a fairly simple library class which I call ClassTemplate.
To use it, I create an interface which has methods coreponding the the public static methods and constructors which the Class is required to have. Constructors are distinguished with an annotation. For example we might define.
public interface NumberClassTemplate {
   @Constructor Number fromString(String v);
   }or
public interface MainClassTemplate {
   void main(String[] args);
}You can then create an instance of ClassTemplate based on that interface. Then, from that, you get an implementation of the template interface which accesses the class. (it's a proxy object, of course).
So
ClassTemplate<MainClassTemplate> mainClassTemplate = ClassTemplate.getInstance(MainClassTemplate.class);
try {
     MainClassTemplate mainClassProxy = mainClassTemplate.create("my.MainClass");
     mainClassProxy.main(new String[]{"arg1});
    } catch(ClassNotFoundException e) {
      // no such class
   } catch (ClassTemplateException e) {
     // class does not conform to template
  }What do you think of such an approach? Would it provide a neater alternative to factory classes or the insistence on bean patterns in some cases?
(I've written the relevant classes, and it all seems to work fine).

Answer 1

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by wang wanding ([email protected]):
I have encountered a error when I installed Dynamic News Sample and build it in JDeveloper3.1.
The main environments are: Oracle8.1.6, Java1.2 , Oracle XML Parser2 for Java , Oracle XSU12.
The error is:
"method endElement(java.lang.object) not found in class
oracle.xml.sql.docgen.OracleXMLDocGenDom."
If you can help me, I will always remember you.
<HR></BLOCKQUOTE>
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