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Creating Java classes on fly

Bob Mathews
Ranch Hand

Joined: Feb 26, 2006
Posts: 43
Hi all,

Can any one tell me how can I create Java classes on the fly.

Like if I provide name of the java class(fully qualified), with specification of its methods and fields how can I create java classes on fly.

Do I need some Byte code engg. or I can do it with Plane reflection

Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42584
Reflection only works on existing objects (and hence, classes). But you can construct classes from source code at runtime using a library like Javassist. This article I wrote for the JavaRanch Journal explains how it's done.

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It is sorta covered in the JavaRanch Style Guide.
subject: Creating Java classes on fly