Example java as script

Example.java

import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

record Options(
        boolean verbose,
        List<String> inputs
) {}

public static void main(String[] args) {
    Options opts = parseArgs(args);

    if (opts.verbose()) {
        System.out.println("Verbose mode on");
        System.out.println("Inputs  : " + opts.inputs());
    }

    // do your work here...
    System.out.println("Scripted");
}

private static Options parseArgs(String[] args) {
    boolean verbose = false;
    List<String> inputs = new ArrayList<>();

    for (int i = 0; i < args.length; i++) {
        String a = args[i];

        switch (a) {
            case "-h", "--help" -> {
                printUsage();
                System.exit(0);
            }
            case "-v", "--verbose" -> verbose = true;
            default -> {
                if (a.startsWith("-")) {
                    System.err.println("Unknown option: " + a);
                    printUsage();
                    System.exit(1);
                } else {
                    // positional argument
                    inputs.add(a);
                }
            }
        }
    }

    return new Options(verbose, List.copyOf(inputs));
}

private static String requireValue(String[] args, int i, String opt) {
    if (i >= args.length) {
        System.err.println("Option " + opt + " requires a value");
        printUsage();
        System.exit(1);
    }
    return args[i];
}

private static void printUsage() {
    String usage = """
            Usage: example [OPTIONS] [INPUTS...]

            Options:
              -h, --help             Show this help message and exit
              -v, --verbose          Enable verbose output

            Examples:
              ./example input1.txt input2.txt
              ./example -v input1.txt
            """;
    System.out.print(usage);
}