code: public void printSingleLineUsage(Writer w, ResourceBundle rb) {
          checkNonNull(w, "Writer");
          
  		PrintWriter pw = new PrintWriter(w);
  		for (OptionHandler h : arguments) {
  			printSingleLineOption(pw, h, rb);
  		}
  		for (OptionHandler h : options) {
  			printSingleLineOption(pw, h, rb);
  		}
  		pw.flush();
  	}
docs: TODO test this!