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Sunday, 1 July 2018

Apache Commons CLI - Help Example

Apache Commons CLI - Help Example


Apache Commons CLI provides HelpFormatter class to print the help related to command line arguments. See the example.

Example

CLITester.java
import java.io.PrintWriter;

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();

      final PrintWriter writer = new PrintWriter(System.out);
      formatter.printUsage(writer,80,"CLITester", options);
      writer.flush();    
   } 
}

Output

Run the file and see the result.
java CLITester
usage: CLITester [-g] [-n <arg>] [-p]

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