Hi There,
Let me address your problem. You get strings from a database for
a> Class Name (say "c" ) &
b> Method name (say "m" )
Now you want to invoke method "m" on an object of class "c" . But the thing
is that you don't have an instance of this class. So here is what you can do
:-
Class classObject = Class.forName( "c" );
Object objInstance = classObject.newInstance();
Now to invoke any method on an object on of the two things are necesary...
1> Either you know what parameters the methos will intake, in this case you
could have easily done something like
Class[] parameterList = new Class[n];
<<block to assign values to this array >>
Method m = classObject.getMethod("m", parameterList);
Here 'n' is the number of parameters. You populate it and pass it.
Now you can invoke this method as follows..
Object[] parameters = new Object[n];
<<block to assign values to this array >>
Object result = m.invoke(objInstance, parameters);
Thus your task is accomplished...
2> You don't know the exact method signature but your have some logic to
meet any signature,
Then you can get the list of parameters types as
Class[] pClasses = m.getParameterTypes();
Based upon this array you can form an array of parameter objects using your
logic and invoke the method as in the previous case........
I hope that this will help you.
Regards,
Daljit Singh Dhillon.
=======================
It's never too late to begin
=======================
----- Original Message -----
From: Thanasis Papakostas <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 26, 2000 3:41 PM
Subject: Urgent problem-Please help!
> Hi,
> I 'm working on a project and I have encountered a problem. "I have
> to call a method of a class."
> It seems quite simple till here. However the name of the class and
> the method will be known at run-time.
> They will be retrieved from a database as Strings. The communication
> beween the classes is handled by CORBA.
> The Reflection and Introspection APIs aren't suitable here because I
> don't even know the name of the class at
> deployment time in order to get a reflection of the constructors,
> methods and Fields. My actual question is
> "Can I call a method whose name is stored in a String? If Yes HOW?"
>
> Thanks in advance
>
>
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