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generating classes dynamically....

deshki raja
Greenhorn

Joined: Apr 03, 2009
Posts: 12
Hi,
I want to generate classes dynamically based on the user inputs......is it possible in java ? Can anyone help me on this....?
Maneesh Godbole
Saloon Keeper

Joined: Jul 26, 2007
Posts: 10167
    
    8

You need to clarify more.
What do you exactly mean by dynamic classes? Are you sure you want to mean classes and not objects?


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Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41076
    
  43
I moved this question to the Intermediate forum - this is definitely not a beginner's question :-)

One way of doing so is to use a library that can construct classes, like Javassist. I wrote an article about doing just that in the JavaRanch Journal a while ago.


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deshki raja
Greenhorn

Joined: Apr 03, 2009
Posts: 12
what i meant was that...depending on the user inputs ....i want to create a class, generate the methods and create objects of the class...........
Maneesh Godbole
Saloon Keeper

Joined: Jul 26, 2007
Posts: 10167
    
    8

Well then Ulf's link talks just exactly about that.
deshki raja
Greenhorn

Joined: Apr 03, 2009
Posts: 12
any other way to do this ?
Ulf Dittmer
Marshal

Joined: Mar 22, 2005
Posts: 41076
    
  43
What do you mean by "other way"? Is the suggested approach somehow not feasible in your situation? If so, tell us why it isn't.
ashishs Sinha
Greenhorn

Joined: Jul 01, 2008
Posts: 3
I guess you would be looking for two separate functionalities
1 - To generate class dynamically . You can generate java class dynamically using com.sun.codemodel pacakage.
This package provides lots of functionality to generate class programmatically - including adding method, extending/implementing other class and interface.

2 - To compile and generate class file or fetch error in runtime.
For this, you can use sun package - com.sun.tools.javac.Main to compile and to parse result or compiler error there are utility classes provided by apache in the package - org.apache.commons.jci.compilers and org.apache.commons.jci.problems

We are generating, compiling lot of classes dynamically based on user input. Later we are invoking the classes and storing the execution result in our database.
 
 
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