How do I parse command line arguments in Java

Question

What is a good way of parsing command line arguments in Java

User · Answer

I wrote another one  http   argparse4j sourceforge net   Argparse4j is a command line argument parser library for Java  based on Python s argparse

User · Answer

Take a look at the Commons CLI project  lots of good stuff in there

User · Answer

If you are familiar with gnu getopt  there is a Java port at  http   www urbanophile com arenn hacking download htm   There appears to be a some classes that do this     http   docs sun com source 816-5618-10 netscape ldap util GetOpt html http   xml apache org xalan-j apidocs org apache xalan xsltc cmdline getopt GetOpt html

User · Answer

Check these out    http   commons apache org cli  http   www martiansoftware com jsap  http   picocli info    Or roll your own    http   docs oracle com javase 7 docs api java util Scanner html     For instance  this is how you use commons-cli to parse 2 string arguments   import org apache commons cli     public class Main         public static void main String   args  throws Exception            Options options   new Options             Option input   new Option  i    input   true   input file path            input setRequired true           options addOption input            Option output   new Option  o    output   true   output file            output setRequired true           options addOption output            CommandLineParser parser   new DefaultParser            HelpFormatter formatter   new HelpFormatter            CommandLine cmd           try               cmd   parser parse options  args             catch  ParseException e                System out println e getMessage                 formatter printHelp  utility-name   options                System exit 1                      String inputFilePath   cmd getOptionValue  input            String outputFilePath   cmd getOptionValue  output             System out println inputFilePath           System out println outputFilePath               usage from command line     gt  java -jar target my-utility jar -i asd                                                                                        Missing required option  o  usage  utility-name  -i --input  lt arg gt     input file path  -o --output  lt arg gt    output file

User · Answer

Yeap   I think you re looking for something like this  http   commons apache org cli     The Apache Commons CLI library provides an API for processing command line interfaces

User · Answer

I want to show you my implementation  ReadyCLI Advantages   for lazy programmers  a very small number of classes to learn  just see the two small examples on the README in the repository and you are already at 90  of learning  just start coding your CLI Parser without any other knowledge  ReadyCLI allows coding CLIs in the most natural way  it is designed with Developer Experience in mind  it largely uses the Builder design pattern and functional interfaces for Lambda Expressions  to allow a very quick coding  it supports Options  Flags and Sub-Commands  it allows to parse arguments from command-line and to build more complex and interactive CLIs  a CLI can be started on Standard I O just as easily as on any other I O interface  such as sockets  it gives great support for documentation of commands   I developed this project as I needed new features  options  flag  sub-commands  and that could be used in the simplest possible way in my projects

User · Answer

Maybe these   JArgs command line option parsing suite for Java - this tiny project provides a convenient  compact  pre-packaged and comprehensively documented suite of command line option parsers for the use of Java programmers  Initially  parsing compatible with GNU-style  getopt  is provided   ritopt  The Ultimate Options Parser for Java - Although  several command line option standards have been preposed  ritopt follows the conventions prescribed in the opt package

User · Answer

Someone pointed me to args4j lately which is annotation based  I really like it

User · Answer

Take a look at the Commons CLI project  lots of good stuff in there

User · Answer

I have been trying to maintain a list of Java CLI parsers    Airline   Active Fork  https   github com rvesse airline  argparse4j argparser args4j clajr cli-parser CmdLn Commandline DocOpt java dolphin getopt DPML CLI  Jakarta Commons CLI2 fork  Dr  Matthias Laux Jakarta Commons CLI jargo jargp jargs java-getopt jbock JCLAP jcmdline jcommander jcommando jewelcli  written by me  JOpt simple jsap naturalcli Object Mentor CLI article  more about refactoring and TDD  parse-cmd ritopt Rop TE-Code Command picocli has ANSI colorized usage help and autocomplete

User · Answer

Check these out    http   commons apache org cli  http   www martiansoftware com jsap  http   picocli info    Or roll your own    http   docs oracle com javase 7 docs api java util Scanner html     For instance  this is how you use commons-cli to parse 2 string arguments   import org apache commons cli     public class Main         public static void main String   args  throws Exception            Options options   new Options             Option input   new Option  i    input   true   input file path            input setRequired true           options addOption input            Option output   new Option  o    output   true   output file            output setRequired true           options addOption output            CommandLineParser parser   new DefaultParser            HelpFormatter formatter   new HelpFormatter            CommandLine cmd           try               cmd   parser parse options  args             catch  ParseException e                System out println e getMessage                 formatter printHelp  utility-name   options                System exit 1                      String inputFilePath   cmd getOptionValue  input            String outputFilePath   cmd getOptionValue  output             System out println inputFilePath           System out println outputFilePath               usage from command line     gt  java -jar target my-utility jar -i asd                                                                                        Missing required option  o  usage  utility-name  -i --input  lt arg gt     input file path  -o --output  lt arg gt    output file

User · Answer

It is 2021  time to do better than Commons CLI     -   Should you build your own Java command line parser  or use a library  Many small utility-like applications probably roll their own command line parsing to avoid the additional external dependency  picocli may be an interesting alternative  Picocli is a modern library and framework for building powerful  user-friendly  GraalVM-enabled command line apps with ease  It lives in 1 source file so apps can include it as source to avoid adding a dependency  It supports colors  autocompletion  subcommands  and more  Written in Java  usable from Groovy  Kotlin  Scala  etc   Features   Annotation based  declarative  avoids duplication and expresses programmer intent Convenient  parse user input and run your business logic with one line of code Strongly typed everything - command line options as well as positional parameters POSIX clustered short options   lt command gt  -xvfInputFile as well as  lt command gt  -x -v -f InputFile  Fine-grained control  an arity model that allows a minimum  maximum and variable number of parameters  e g   quot 1    quot    quot 3  5 quot  Subcommands  can be nested to arbitrary depth  Feature-rich  composable arg groups  splitting quoted args  repeatable subcommands  and many more User-friendly  usage help message uses colors to contrast important elements like option names from the rest of the usage help to reduce the cognitive load on the user Distribute your app as a GraalVM native image Works with Java 5 and higher Extensive and meticulous documentation  The usage help message is easy to customize with annotations  without programming   For example    source  I couldn t resist adding one more screenshot to show what usage help messages are possible  Usage help is the face of your application  so be creative and have fun   Disclaimer  I created picocli  Feedback or questions very welcome

User · Answer

Take a look at the more recent JCommander   I created it  I   m happy to receive questions or feature requests

User · Answer

I ve used JOpt and found it quite handy  http   jopt-simple sourceforge net   The front page also provides a list of about 8 alternative libraries  check them out and pick the one that most suits your needs

User · Answer

If you are already using Spring Boot  argument parsing comes out of the box    If you want to run something after startup  implement the ApplicationRunner interface    SpringBootApplication public class Application implements ApplicationRunner      public static void main String   args        SpringApplication run Application class  args           Override   public void run ApplicationArguments args        args containsOption  my-flag-option       test if --my-flag-option was set     args getOptionValues  my-option           returns values of --my-option value1 --my-option value2      args getOptionNames                       returns a list of all available options        do something with your args         Your run method will be invoked after the context has started up successfully    If you need access to the arguments before you fire up your application context  you can just simply parse the application arguments manually    SpringBootApplication public class Application implements ApplicationRunner      public static void main String   args        ApplicationArguments arguments   new DefaultApplicationArguments args          do whatever you like with your arguments        see above         SpringApplication run Application class  args            And finally  if you need access to your arguments in a bean  just inject the ApplicationArguments    Component public class MyBean        Autowired    private ApplicationArguments arguments

User · Answer

Someone pointed me to args4j lately which is annotation based  I really like it

User · Answer

As one of the comments mentioned earlier  https   github com pcj google-options  would be a good choice to start with     One thing I want to add-on is   1  If you run into some parser reflection error  please try use a newer version of the guava  in my case   maven jar      name    com google guava guava       artifact    com google guava guava 19 0       server    maven2 server      maven jar      name    com github pcj google options       artifact    com github pcj google-options jar 1 0 0       server    maven2 server      maven server      name    maven2 server       url    http   central maven org maven2        2  When running the commandline   bazel run path to your project -- --var1 something --var2 something -v something   3  When you need the usage help  just type   bazel run path to your project -- --help

User · Answer

Argparse4j is best I have found  It mimics Python s argparse libary which is very convenient and powerful

User · Answer

If you are familiar with gnu getopt  there is a Java port at  http   www urbanophile com arenn hacking download htm   There appears to be a some classes that do this     http   docs sun com source 816-5618-10 netscape ldap util GetOpt html http   xml apache org xalan-j apidocs org apache xalan xsltc cmdline getopt GetOpt html

User · Answer

I want to show you my implementation  ReadyCLI Advantages   for lazy programmers  a very small number of classes to learn  just see the two small examples on the README in the repository and you are already at 90  of learning  just start coding your CLI Parser without any other knowledge  ReadyCLI allows coding CLIs in the most natural way  it is designed with Developer Experience in mind  it largely uses the Builder design pattern and functional interfaces for Lambda Expressions  to allow a very quick coding  it supports Options  Flags and Sub-Commands  it allows to parse arguments from command-line and to build more complex and interactive CLIs  a CLI can be started on Standard I O just as easily as on any other I O interface  such as sockets  it gives great support for documentation of commands   I developed this project as I needed new features  options  flag  sub-commands  and that could be used in the simplest possible way in my projects

User · Answer

Check these out    http   commons apache org cli  http   www martiansoftware com jsap  http   picocli info    Or roll your own    http   docs oracle com javase 7 docs api java util Scanner html     For instance  this is how you use commons-cli to parse 2 string arguments   import org apache commons cli     public class Main         public static void main String   args  throws Exception            Options options   new Options             Option input   new Option  i    input   true   input file path            input setRequired true           options addOption input            Option output   new Option  o    output   true   output file            output setRequired true           options addOption output            CommandLineParser parser   new DefaultParser            HelpFormatter formatter   new HelpFormatter            CommandLine cmd           try               cmd   parser parse options  args             catch  ParseException e                System out println e getMessage                 formatter printHelp  utility-name   options                System exit 1                      String inputFilePath   cmd getOptionValue  input            String outputFilePath   cmd getOptionValue  output             System out println inputFilePath           System out println outputFilePath               usage from command line     gt  java -jar target my-utility jar -i asd                                                                                        Missing required option  o  usage  utility-name  -i --input  lt arg gt     input file path  -o --output  lt arg gt    output file

User · Answer

I ve used JOpt and found it quite handy  http   jopt-simple sourceforge net   The front page also provides a list of about 8 alternative libraries  check them out and pick the one that most suits your needs

User · Answer

If you are familiar with gnu getopt  there is a Java port at  http   www urbanophile com arenn hacking download htm   There appears to be a some classes that do this     http   docs sun com source 816-5618-10 netscape ldap util GetOpt html http   xml apache org xalan-j apidocs org apache xalan xsltc cmdline getopt GetOpt html

User · Answer

Maybe these   JArgs command line option parsing suite for Java - this tiny project provides a convenient  compact  pre-packaged and comprehensively documented suite of command line option parsers for the use of Java programmers  Initially  parsing compatible with GNU-style  getopt  is provided   ritopt  The Ultimate Options Parser for Java - Although  several command line option standards have been preposed  ritopt follows the conventions prescribed in the opt package

User · Answer

Check these out    http   commons apache org cli  http   www martiansoftware com jsap  http   picocli info    Or roll your own    http   docs oracle com javase 7 docs api java util Scanner html     For instance  this is how you use commons-cli to parse 2 string arguments   import org apache commons cli     public class Main         public static void main String   args  throws Exception            Options options   new Options             Option input   new Option  i    input   true   input file path            input setRequired true           options addOption input            Option output   new Option  o    output   true   output file            output setRequired true           options addOption output            CommandLineParser parser   new DefaultParser            HelpFormatter formatter   new HelpFormatter            CommandLine cmd           try               cmd   parser parse options  args             catch  ParseException e                System out println e getMessage                 formatter printHelp  utility-name   options                System exit 1                      String inputFilePath   cmd getOptionValue  input            String outputFilePath   cmd getOptionValue  output             System out println inputFilePath           System out println outputFilePath               usage from command line     gt  java -jar target my-utility jar -i asd                                                                                        Missing required option  o  usage  utility-name  -i --input  lt arg gt     input file path  -o --output  lt arg gt    output file

User · Answer

Yeap   I think you re looking for something like this  http   commons apache org cli     The Apache Commons CLI library provides an API for processing command line interfaces

User · Answer

This is Google s command line parsing library open-sourced as part of the Bazel project  Personally I think it s the best one out there  and far easier than Apache CLI   https   github com pcj google-options  Installation  Bazel  maven jar      name    com github pcj google options       artifact    com github pcj google-options jar 1 0 0       sha1    85d54fe6771e5ff0d54827b0a3315c3e12fdd0c7       Gradle  dependencies     compile  com github pcj google-options 1 0 0      Maven   lt dependency gt     lt groupId gt com github pcj lt  groupId gt     lt artifactId gt google-options lt  artifactId gt     lt version gt 1 0 0 lt  version gt   lt  dependency gt    Usage  Create a class that extends OptionsBase and defines your  Option s    package example   import com google devtools common options Option  import com google devtools common options OptionsBase   import java util List          Command-line options definition for example server      public class ServerOptions extends OptionsBase       Option        name    help         abbrev    h         help    Prints usage info          defaultValue    true          public boolean help      Option        name    host         abbrev    o         help    The server host          category    startup         defaultValue            public String host      Option      name    port       abbrev    p       help    The server port        category    startup       defaultValue    8080            public int port      Option      name    dir       abbrev    d       help    Name of directory to serve static files        category    startup       allowMultiple   true      defaultValue                public List lt String gt  dirs       Parse the arguments and use them   package example   import com google devtools common options OptionsParser  import java util Collections   public class Server      public static void main String   args        OptionsParser parser   OptionsParser newOptionsParser ServerOptions class       parser parseAndExitUponError args       ServerOptions options   parser getOptions ServerOptions class       if  options host isEmpty      options port  lt  0    options dirs isEmpty            printUsage parser         return             System out format  Starting server at  s  d    n   options host  options port       for  String dirname   options dirs          System out format    -- gt  Serving static files at  lt  s gt  n   dirname                private static void printUsage OptionsParser parser        System out println  Usage  java -jar server jar OPTIONS        System out println parser describeOptions Collections  lt String  String gt emptyMap                                                  OptionsParser HelpVerbosity LONG             https   github com pcj google-options

User · Answer

I have been trying to maintain a list of Java CLI parsers    Airline   Active Fork  https   github com rvesse airline  argparse4j argparser args4j clajr cli-parser CmdLn Commandline DocOpt java dolphin getopt DPML CLI  Jakarta Commons CLI2 fork  Dr  Matthias Laux Jakarta Commons CLI jargo jargp jargs java-getopt jbock JCLAP jcmdline jcommander jcommando jewelcli  written by me  JOpt simple jsap naturalcli Object Mentor CLI article  more about refactoring and TDD  parse-cmd ritopt Rop TE-Code Command picocli has ANSI colorized usage help and autocomplete

User · Answer

Someone pointed me to args4j lately which is annotation based  I really like it

User · Answer

Maybe these   JArgs command line option parsing suite for Java - this tiny project provides a convenient  compact  pre-packaged and comprehensively documented suite of command line option parsers for the use of Java programmers  Initially  parsing compatible with GNU-style  getopt  is provided   ritopt  The Ultimate Options Parser for Java - Although  several command line option standards have been preposed  ritopt follows the conventions prescribed in the opt package

User · Answer

Someone pointed me to args4j lately which is annotation based  I really like it

User · Answer

airline   Github looks good  It is based on annotation and is trying to emulate Git command line structures

User · Answer

Yeap   I think you re looking for something like this  http   commons apache org cli     The Apache Commons CLI library provides an API for processing command line interfaces

User · Answer

I wrote another one  http   argparse4j sourceforge net   Argparse4j is a command line argument parser library for Java  based on Python s argparse

User · Answer

Take a look at the Commons CLI project  lots of good stuff in there

User · Answer

If you are already using Spring Boot  argument parsing comes out of the box    If you want to run something after startup  implement the ApplicationRunner interface    SpringBootApplication public class Application implements ApplicationRunner      public static void main String   args        SpringApplication run Application class  args           Override   public void run ApplicationArguments args        args containsOption  my-flag-option       test if --my-flag-option was set     args getOptionValues  my-option           returns values of --my-option value1 --my-option value2      args getOptionNames                       returns a list of all available options        do something with your args         Your run method will be invoked after the context has started up successfully    If you need access to the arguments before you fire up your application context  you can just simply parse the application arguments manually    SpringBootApplication public class Application implements ApplicationRunner      public static void main String   args        ApplicationArguments arguments   new DefaultApplicationArguments args          do whatever you like with your arguments        see above         SpringApplication run Application class  args            And finally  if you need access to your arguments in a bean  just inject the ApplicationArguments    Component public class MyBean        Autowired    private ApplicationArguments arguments

User · Answer

Take a look at the Commons CLI project  lots of good stuff in there

User · Answer

For Spring users  we should mention also https   docs spring io spring docs current javadoc-api org springframework core env SimpleCommandLinePropertySource html  and his twin brother https   docs spring io spring docs current javadoc-api org springframework core env JOptCommandLinePropertySource html  JOpt implementation of the same functionality    The advantage in Spring is that you can directly bind the command line arguments to attributes  there is an example here https   docs spring io spring docs current javadoc-api org springframework core env CommandLinePropertySource html

User · Answer

I know most people here are going to find 10 million reasons why they dislike my way  but nevermind  I like to keep things simple  so I just separate the key from the value using a     and store them in a HashMap like this   Map lt String  String gt  argsMap   new HashMap lt  gt     for  String arg  args        String   parts   arg split           argsMap put parts 0   parts 1         You could always maintain a list with the arguments you are expecting  to help the user in case he forgot an argument or used a wrong one    However  if you want too many features this solution is not for you anyway

User · Answer

If you want something lightweight  jar size   20 kb  and simple to use  you can try argument-parser  It can be used in most of the use cases  supports specifying arrays in the argument and has no dependency on any other library  It works for Java 1 5 or above  Below excerpt shows an example on how to use it   public static void main String   args        String usage    --day -d day --mon -m month  --year -y year  --dir -ds directoriesToSearch        ArgumentParser argParser   new ArgumentParser usage  InputData class       InputData inputData    InputData  argParser parse args       showData inputData        new StatsGenerator   generateStats inputData       More examples can be found here

User · Answer

It is 2021  time to do better than Commons CLI     -   Should you build your own Java command line parser  or use a library  Many small utility-like applications probably roll their own command line parsing to avoid the additional external dependency  picocli may be an interesting alternative  Picocli is a modern library and framework for building powerful  user-friendly  GraalVM-enabled command line apps with ease  It lives in 1 source file so apps can include it as source to avoid adding a dependency  It supports colors  autocompletion  subcommands  and more  Written in Java  usable from Groovy  Kotlin  Scala  etc   Features   Annotation based  declarative  avoids duplication and expresses programmer intent Convenient  parse user input and run your business logic with one line of code Strongly typed everything - command line options as well as positional parameters POSIX clustered short options   lt command gt  -xvfInputFile as well as  lt command gt  -x -v -f InputFile  Fine-grained control  an arity model that allows a minimum  maximum and variable number of parameters  e g   quot 1    quot    quot 3  5 quot  Subcommands  can be nested to arbitrary depth  Feature-rich  composable arg groups  splitting quoted args  repeatable subcommands  and many more User-friendly  usage help message uses colors to contrast important elements like option names from the rest of the usage help to reduce the cognitive load on the user Distribute your app as a GraalVM native image Works with Java 5 and higher Extensive and meticulous documentation  The usage help message is easy to customize with annotations  without programming   For example    source  I couldn t resist adding one more screenshot to show what usage help messages are possible  Usage help is the face of your application  so be creative and have fun   Disclaimer  I created picocli  Feedback or questions very welcome

User · Answer

I ve used JOpt and found it quite handy  http   jopt-simple sourceforge net   The front page also provides a list of about 8 alternative libraries  check them out and pick the one that most suits your needs

User · Answer

If you want something lightweight  jar size   20 kb  and simple to use  you can try argument-parser  It can be used in most of the use cases  supports specifying arrays in the argument and has no dependency on any other library  It works for Java 1 5 or above  Below excerpt shows an example on how to use it   public static void main String   args        String usage    --day -d day --mon -m month  --year -y year  --dir -ds directoriesToSearch        ArgumentParser argParser   new ArgumentParser usage  InputData class       InputData inputData    InputData  argParser parse args       showData inputData        new StatsGenerator   generateStats inputData       More examples can be found here

User · Answer

For Spring users  we should mention also https   docs spring io spring docs current javadoc-api org springframework core env SimpleCommandLinePropertySource html  and his twin brother https   docs spring io spring docs current javadoc-api org springframework core env JOptCommandLinePropertySource html  JOpt implementation of the same functionality    The advantage in Spring is that you can directly bind the command line arguments to attributes  there is an example here https   docs spring io spring docs current javadoc-api org springframework core env CommandLinePropertySource html

User · Answer

I ve used JOpt and found it quite handy  http   jopt-simple sourceforge net   The front page also provides a list of about 8 alternative libraries  check them out and pick the one that most suits your needs

User · Answer

Argparse4j is best I have found  It mimics Python s argparse libary which is very convenient and powerful

User · Answer

As one of the comments mentioned earlier  https   github com pcj google-options  would be a good choice to start with     One thing I want to add-on is   1  If you run into some parser reflection error  please try use a newer version of the guava  in my case   maven jar      name    com google guava guava       artifact    com google guava guava 19 0       server    maven2 server      maven jar      name    com github pcj google options       artifact    com github pcj google-options jar 1 0 0       server    maven2 server      maven server      name    maven2 server       url    http   central maven org maven2        2  When running the commandline   bazel run path to your project -- --var1 something --var2 something -v something   3  When you need the usage help  just type   bazel run path to your project -- --help

User · Answer

airline   Github looks good  It is based on annotation and is trying to emulate Git command line structures

User · Answer

If you are familiar with gnu getopt  there is a Java port at  http   www urbanophile com arenn hacking download htm   There appears to be a some classes that do this     http   docs sun com source 816-5618-10 netscape ldap util GetOpt html http   xml apache org xalan-j apidocs org apache xalan xsltc cmdline getopt GetOpt html

User · Answer

Take a look at the more recent JCommander   I created it  I   m happy to receive questions or feature requests

User · Answer

I know most people here are going to find 10 million reasons why they dislike my way  but nevermind  I like to keep things simple  so I just separate the key from the value using a     and store them in a HashMap like this   Map lt String  String gt  argsMap   new HashMap lt  gt     for  String arg  args        String   parts   arg split           argsMap put parts 0   parts 1         You could always maintain a list with the arguments you are expecting  to help the user in case he forgot an argument or used a wrong one    However  if you want too many features this solution is not for you anyway

User · Answer

Maybe these   JArgs command line option parsing suite for Java - this tiny project provides a convenient  compact  pre-packaged and comprehensively documented suite of command line option parsers for the use of Java programmers  Initially  parsing compatible with GNU-style  getopt  is provided   ritopt  The Ultimate Options Parser for Java - Although  several command line option standards have been preposed  ritopt follows the conventions prescribed in the opt package

User · Answer

Yeap   I think you re looking for something like this  http   commons apache org cli     The Apache Commons CLI library provides an API for processing command line interfaces

User · Answer

This is Google s command line parsing library open-sourced as part of the Bazel project  Personally I think it s the best one out there  and far easier than Apache CLI   https   github com pcj google-options  Installation  Bazel  maven jar      name    com github pcj google options       artifact    com github pcj google-options jar 1 0 0       sha1    85d54fe6771e5ff0d54827b0a3315c3e12fdd0c7       Gradle  dependencies     compile  com github pcj google-options 1 0 0      Maven   lt dependency gt     lt groupId gt com github pcj lt  groupId gt     lt artifactId gt google-options lt  artifactId gt     lt version gt 1 0 0 lt  version gt   lt  dependency gt    Usage  Create a class that extends OptionsBase and defines your  Option s    package example   import com google devtools common options Option  import com google devtools common options OptionsBase   import java util List          Command-line options definition for example server      public class ServerOptions extends OptionsBase       Option        name    help         abbrev    h         help    Prints usage info          defaultValue    true          public boolean help      Option        name    host         abbrev    o         help    The server host          category    startup         defaultValue            public String host      Option      name    port       abbrev    p       help    The server port        category    startup       defaultValue    8080            public int port      Option      name    dir       abbrev    d       help    Name of directory to serve static files        category    startup       allowMultiple   true      defaultValue                public List lt String gt  dirs       Parse the arguments and use them   package example   import com google devtools common options OptionsParser  import java util Collections   public class Server      public static void main String   args        OptionsParser parser   OptionsParser newOptionsParser ServerOptions class       parser parseAndExitUponError args       ServerOptions options   parser getOptions ServerOptions class       if  options host isEmpty      options port  lt  0    options dirs isEmpty            printUsage parser         return             System out format  Starting server at  s  d    n   options host  options port       for  String dirname   options dirs          System out format    -- gt  Serving static files at  lt  s gt  n   dirname                private static void printUsage OptionsParser parser        System out println  Usage  java -jar server jar OPTIONS        System out println parser describeOptions Collections  lt String  String gt emptyMap                                                  OptionsParser HelpVerbosity LONG             https   github com pcj google-options

[java] How do I parse command line arguments in Java?

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