Argparse4j - The Java command-line argument parser library

Argparse4j is a command line argument parser library for Java based on Python's argparse module.

Argparse4j is available in Maven central repository:

<dependency>
  <groupId>net.sourceforge.argparse4j</groupId>
  <artifactId>argparse4j</artifactId>
  <version>0.4.3</version>
</dependency>

There are still missing features which exist in argparse but not in argparse4j, but there are also new features which only exist in argparse4j.

Here is summary of features:

• Supported positional arguments and optional arguments.

• Variable number of arguments.

• Generates well formatted line-wrapped help message.

• Suggests optional arguments/sub-command if unrecognized arguments/sub-command were given, e.g.:

  unrecognized argument '--tpye'
  Did you mean:
    --type

• Takes into account East Asian Width ambiguous characters when line-wrap.

• Sub-commands like, git add.

• Sub-command alias names, e.g., co for checkout.

• Customizable option prefix characters, e.g. +f and /h.

• Print default values in help message.

• Choice from given collection of values.

• Type conversion from option strings.

• Can directly assign values into user defined classes using annotation.

• Group arguments so that it will be printed in help message in more readable way.

• Mutually exclusive argument group.

• Read additional arguments from file.

• Argument/sub-command abbreviations.

The primary documentation is done using Sphinx. You need Sphinx to run mvn site.