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Commons CLI API - Long Options
How to manage long options with Apache Commons CLI API?
✍: FYIcenter.com
A long option is a long keyword (multiple characters) option prefixed with "--".
For example, "--help" is a long option.
A long option is supported in Apache Commons CLI API as an alias of a short option. For example, "--help" is an alias of "-h".
A long option can be managed with Apache Commons CLI API in 4 steps:
1. Define Options - A short option can be defined and added to the options collection by long the addOption() method with 4 arguments. For example:
import org.apache.commons.cli.Options; Options options = new Options(); options.addOption("h", "help", false, "Print this help message");
2. Parse Options - A long option can be parsed together with all other options in a single call of CommandLineParser.parse(). For example:
import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.DefaultParser; CommandLineParser parser = new DefaultParser(); CommandLine cmd = parser.parse( options, args);
3. Process Options - A long option can be processed by calling the CommandLine.hasOption() method. For example:
if (cmd.hasOption("help")) { help(options); }
4. Print Options - A long optoin can be printed out as help message together with all other options. For example:
import org.apache.commons.cli.HelpFormatter; HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("LongOptionTest", options);
⇒ Commons CLI API - Long Options Example
⇐ Commons CLI API - Short Options Example
2020-12-22, 806🔥, 0💬
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