Jakarta Commons CLI

import org.apache.commons.cli.base.*;

final Options options = new Options();
final Option helpOpt = OptionBuilder
                .hasArg(false)
                .withArgName("help")
                .isRequired(false)
                .withDescription("このヘルプ")
                .withLongOpt("help")
                .create(HELP_OPT);
options.addOption(helpOpt);
final CommandLineParser parser = new BasicParser();
final CommandLine commandLine = null;

try {
    commandLine = parser.parse(options, args);
} catch (ParseException e) {
    new HelpFormatter().printHelp("homura help", options)
    System.exit(1);
}