Java CLI : Cant parse arguments

Question

I am trying to parse command line arguments as

Options options = new Options();
        options.addOption("c", "count", false, "number of message to be generated");
        options.addOption("s", "size", false, "size of each messages in bytes");
        options.addOption("t", "threads", false, "number of threads");
        options.addOption("r", "is random", false, "is random");
        CommandLine cli = new DefaultParser().parse(options, args);

        int count = Integer.parseInt(cli.getOptionValue("c", "20000000"));
//        int count = Integer.parseInt(cli.getOptionValue("c", "100"));
        int recordSize = Integer.parseInt(cli.getOptionValue("s", "512"));
        int threads = Integer.parseInt(cli.getOptionValue("t","4"));
        boolean isRandom = Boolean.valueOf(cli.getOptionValue("r", "true"));
        System.out.println(" threads "+threads);
        System.out.println(" count "+count);

and i run it in eclipse with

t 6 c 7

but i always get

threads 4
count 20000000

what am i missing?

You passed in false for all of the options you are adding. That parameter is whether the option takes an argument, which for all but the random one, I'd say would be true. — Chill
– Chill, Commented May 26, 2016 at 17:19

Kedar Mhaswade · Accepted Answer · 2016-05-26 17:20:22Z

1

You should use true for addOption method when the option takes an argument. From the Javadoc:

@param hasArg flag signally if an argument is required after this option

    options.addOption("c", "count", true, "number of message to be generated");
    options.addOption("s", "size", true, "size of each messages in bytes");
    options.addOption("t", "threads", true, "number of threads");
    options.addOption("r", "is random", false, "is random");

Yes, and a leading - is required for short option specification (e.g. -t 4) and a leading -- is required for long option specification (e.g. --threads 4).

edited May 26, 2016 at 17:20

answered May 26, 2016 at 17:18

Kedar Mhaswade

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2 Comments

AbtPst Over a year ago

thanks! that did it. after that i still had to specify as -t=6

Kedar Mhaswade Over a year ago

When I specified in the IDE the program arguments as -t 6 -c 200 it seems to work.

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