Apache Commons CLI - Usage Example


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Apache Commons CLI provides HelpFormatter class to print the usage guide of command line arguments. See the example given below −

Example

CLITester.java

import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

public class CLITester {
   public static void main(String[] args) throws ParseException {
	
      Options options = new Options();
      options.addOption("p", "print", false, "Send print request to printer.")
         .addOption("g", "gui", false, "Show GUI Application")
         .addOption("n", true, "No. of copies to print");
			
      HelpFormatter formatter = new HelpFormatter();
      formatter.printHelp("CLITester", options);
   }
}

Output

Run the file and see the result.

java CLITester
usage: CLITester
-g,--gui Show GUI Application
-n <arg> No. of copies to print
-p,--print Send print request to printer.
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