The JSAP object provides two parse() methods to parse a command line. The first takes an array of Strings as its only parameter; in most uses of JSAP, this will simply be the args[] array supplied by the JVM to your main() method.

The second parse() method takes a single String as its only parameter. This method first tokenizes the String into an array, much like the operating system does for the JVM in providing your main() method with the args[] array, then calls the parse(String[]) method described above.

Both of these methods return a JSAPResult object encapsulating the parsed command line.

SimpleJSAP is a subclass of JSAP, and works analogously: however, if an error is detected, or if the user specified --help, a full usage and help message is printed automatically. You can learn whether the message has been printed or not by invoking the method messagePrinted() on the SimpleJSAP instance just after parsing: if it returns true, you shoud usually terminate the program execution.