make a web application，so you need to be good at something about java
I need to refactor a JAR file.
change names of class files, and the possible names related in code.
I need to modify some function names in a JAR file ( crypted ).
the file is required to decompile and make the modification and then compile it without error and without changing the file names class
I have a data analysis task to put functionality in basic snake game built with javescript