Can you tell ne what is mistake in my code?

Question

This code successfully run on my desktop but can't run with sololearn editor it's give some warning or something that i can't understand,please help me to solve this.
https://code.sololearn.com/comkte2oHnOj/?ref=app

Answer 1

sololearn does not support gui

Answer 2

uh... Java in SL cannot animate.

Answer 3

You have to run that type of code elsewhere. SoloLearn can't allow everything possible to run for the obvious implications it could cause, especially since the public can execute the code.