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This is the java version of the Args program described in: http://butunclebob.com/ArticleS.UncleBob.CleanCodeArgs

public class ArgsMain {
  public static void main(String[] args) {
    try {
      Args arg = new Args("l+,p@,d*", args);
      boolean logging = arg.getBoolean('l');
      int port = arg.getInt('p');
      String directory = arg.getString('d');
      executeApplication(logging, port, directory);
    } catch (ArgsException e) {
      System.out.printf("Argument error: %s\n", e.errorMessage());
    }
  }

  private static void executeApplication(boolean logging, int port, String directory) {
    System.out.printf("logging is %s, port:%d, directory:%s\n",logging, port, directory);
  }
}

Schema:
 - char+    - Boolean arg.
 - char*   - String arg.
 - char@   - Integer arg.
 - char@@  - double arg.
 - char[*] - one element of a string array.

Example schema: (f+,s*,n@,a@@,p[*])
Coresponding command line: "-f -s Bob -n 1 -a 3.2 -p e1 -p e2 -p e3