A simple example of how to use args4j to add command line args to a simple “Hello World” type java application.
For example below command line execution would print “Hello arg4j!” instead of the default “Hello World!” if you don’t pass any args.
$ java -jar helloWorldParamaterized --msg='Hello arg4j!'
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| import org.kohsuke.args4j.CmdLineParser; | |
| import org.kohsuke.args4j.Option; | |
| /** | |
| * Hello world! class that is paramaterized (with defaults) using arg4j. | |
| * Example cli usage: java -jar helloWorldParamaterized –msg='Hello arg4j!' | |
| */ | |
| public class helloWorldParamaterized | |
| { | |
| @Option(name="–msg") | |
| private String msg = "Hello World!"; | |
| public static void main(String[] args) throws Exception { | |
| new helloWorldParamaterized().doMain(args); | |
| } | |
| public void doMain(String[] args) throws Exception { | |
| // make a parser | |
| CmdLineParser parser = new CmdLineParser(this); | |
| // parse args | |
| parser.parseArgument(args); | |
| // print message passed in from args | |
| System.out.println(msg); | |
| } | |
| } |
