Look into Else If statements if you need an answer fast... but I will reinforce what mazentheamazin has already said, Its best you learn java...
Remove the semicolon from the end of line 101. That might fix the issue
Just had a quick read of it, and its mostly empty classes, with one of them allowing a player to basically change himself to op and de-op everyone...
Hey so i quickly drew this plugin up, but there is some differences between what you requested and the end result so disregard this if you are...
Separate names with a comma.