It would be fairly easy to rewrite the application to run as an applet. Put the GUI and code into a panel that could be either added to a JFrame for the application or to a JApplet for the applet.
Any file I/O would have to be changed. But that would always be true.
The problem is the imageas do not show up. Does an applet abide to specific methods. And what do you mean by GUI i know its graphics user interface but are u specifically referring to Layout MAnager, Jpanel, etc. I did that adn again as i said evrything shows up except for the images i set for the program.
You need to handle image files as resources not as disk files. Use the getResources methods and put the images on the classpath. Normally that would be in a jar file.
The GUI would be what you see on the screen.
See the getResource methods in the API doc to see how they work.
They return a value that can be used to read the contents of an image file.
There are lots of code samples on the forum if you do a search.
Applets are restricted in the I/O they can do. They often can not read from a PC's disk.
Try putting the file you want to read in the jar file and using the getResources methods to read the file. Did you try searching on the forum for sample code that uses getResource?