Java tutorial
package com.basingwerk.utilisation; import java.io.File; import org.jfree.ui.RefineryUtilities; import org.apache.commons.cli.CommandLine; import org.apache.commons.cli.CommandLineParser; import org.apache.commons.cli.HelpFormatter; import org.apache.commons.cli.Option; import org.apache.commons.cli.Options; import org.apache.commons.cli.ParseException; import org.apache.commons.cli.PosixParser; public class Utilisation { public static void printVersion() { System.out.print( "Copyright (c) The University of Liverpool, 2014 (Licensed under the GNU General Public License, version 3)\n\n"); System.out.print("Version 1.0\n\n"); } public static void main(final String[] args) { String dataFile = null; Options options = new Options(); Option helpOption = new Option("h", "help", false, "print this help"); Option serverURLOption = new Option("l", "logfile", true, "log file"); options.addOption(helpOption); options.addOption(serverURLOption); CommandLineParser argsParser = new PosixParser(); try { CommandLine commandLine = argsParser.parse(options, args); if (commandLine.hasOption(helpOption.getOpt())) { HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("Usage grapher", options); System.exit(0); } dataFile = commandLine.getOptionValue(serverURLOption.getOpt()); String[] otherArgs = commandLine.getArgs(); if (dataFile == null || otherArgs.length > 1) { System.out.println("Please specify a logfile"); HelpFormatter formatter = new HelpFormatter(); formatter.printHelp("Usage grapher", options); System.exit(0); } } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { } final UsagePlotter demo = new UsagePlotter("Usage", new File(dataFile)); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }