unable to run command line on javac

Question

so i am trying to run trollegle script by jtrygva , it said use the command line : "C:\Program Files\Java\jdk-9\bin\javac.exe" -encoding utf-8 anon/trollegle/*.java but when I use it on powershell of the folder containing the files , it shows this error :

+ "C:\Program Files\Java\jdk-9\bin\javac.exe" -encoding utf-8 anon/trol ...
+                                             ~~~~~~~~~
Unexpected token '-encoding' in expression or statement.
At line:1 char:55
+ "C:\Program Files\Java\jdk-9\bin\javac.exe" -encoding utf-8 anon/trol ...
+                                                       ~~~~~
Unexpected token 'utf-8' in expression or statement.
    + CategoryInfo          : ParserError: (:) [], ParentContainsErrorRecordException
    + FullyQualifiedErrorId : UnexpectedToken```

I tried using single quotes and double quotes with encoding argument but it did not work, please help me. 
source code can be found on: https://gitlab.com/jtrygva/trollegle/-/tree/master