class structure
I have two java class files which are about 1MB in size. When I decompile them I get a file of size about 30KB. When these classes are run they show an iconified frame, but there is no icon in the folder (The class has been copied to a new location). It seems that the class has embedded files in it.
How can this embedding of files be done?
If this is not appropriate forum, please suggest where should I post his topic.
Thanks.
Class files don't have embedded files in them.
There's a few possibilities,
1. A default icon is provided by Java
2. They have embedded a bitmap, as an array of bytes, into the Java code itself.
3. The icon is on the classpath somewhere, and is being picked up from there. and not your new location.
regards,
Owen
Well omcgovern, you have very well highlighted some possibilities. Keeping the icon topic aside, I would like to remind you about the size of the class - IMB and decompiled source code - 30KB.
> 1. A default icon is provided by Java
> 3. The icon is on the classpath somewhere, and is
> being picked up from there. and not your new
> location.
I tried to run the class on a variety of environments, and that is why I am sure that the icon is somewhere in the class.
> 2. They have embedded a bitmap, as an array of bytes,
> into the Java code itself.
This is something I also thought, but the array should have been visible somewhere in the class.
The class shows a JFrame, buttons,dialogs and other such swing components. I searched the class byte code for methods like setVisible(), JFrame, javax.. I could not find a sign of swing!
The class might have been obfuscated. But decompilers show errors while decompiling an obfuscated class, I don't remember any although I have tried two or three decompilers.
I think, as you said, the resources might be in an array in the class. They might have been kept encrypted, and decrypted on execution. The class (that I am talking about) extends ClassLoader. So it seems quiet possible that the class uses loadClass(byte[]b,...)method to load the classes associated with the GUI items. And perhaps it may be hidden or/as well as obfuscated. So the the topic of this thread may be latent arrays!
If you ask, I can give you the class file and the decompiled source for your periusal.
Please do reply.
Thanks.
