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args4j comes with a built-in support for parsing options into several Java datatypes (such as <<<int>>>, <<<String>>>, and <<<Enum>>>). You can extend this further by writing your own {{{apidocs/org/kohsuke/args4j/spi/OptionHandler.html}OptionHandler}} implementation, then registering it to the <<<CmdLineParser>>> class.
In fact, most of the built-in support is implemented using this mechanism. The <<<OptionHandler>>> class's source code details how to do this.
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