Running
Running under Windows 9x/2000/NT/ME/XP Explorer
Windows explorer can run a jar file by just double-clicking it; if that doesn't work for you, try the command line instructions. For some reason, .jar files have the Wordpad icon by default. I don't know why.
Running from Command Line
Please check the Java documentation for running a jar executable under your operating system. Typically you would enter "java -jar Jail.jar" from a command line.