问免费在哪里？

import org.apache.commons.cli.*;

public class Main {

    public static void main(String[] args) throws Exception {

        Options options = new Options();

        Option input = new Option("i", "input", true, "input file path");

        input.setRequired(true);

        options.addOption(input);

        Option output = new Option("o", "output", true, "output file");

        output.setRequired(true);

        options.addOption(output);

        CommandLineParser parser = new DefaultParser();

        HelpFormatter formatter = new HelpFormatter();

        CommandLine cmd;

        try {

            cmd = parser.parse(options, args);

        } catch (ParseException e) {

            System.out.println(e.getMessage());

            formatter.printHelp("utility-name", options);

            System.exit(1);

            return;

        }

        String inputFilePath = cmd.getOptionValue("input");

        String outputFilePath = cmd.getOptionValue("output");

        System.out.println(inputFilePath);

        System.out.println(outputFilePath);

    }

}

$> java -jar target/my-utility.jar -i asd                                                                                       

Missing required option: o

usage: utility-name

 -i,--input <arg>    input file path

 -o,--output <arg>   output file