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Because we only want to have a very small example, we use only one single directory containing all the stuff— sources, class files and the args4j jarfile.
You need a JDK 1. Create the business bean Business. At this point, it only contains the business logic. To run this logic, we want a run method. The starter class had a look into the Java system property mainclass loads that class, instantiates it, and executes their run method. We provide the classpath so the Java VM could find the starter class and our business class.
The starter class catches this and prints a help message: Since we don't have an Argument , that line is not Business [options] arguments. As you can see, we added an Option to an attribute and to a setter method.
Using this with attributes is the simplest way to use args4j. But if you wanted to do some checks e. If you want to have more control over parsing and error handling, don't use the starter.
Since we're not using the Starter , we also have to supply the main method and start it. So, after compiling, we could start that with:. Content Navigation Footer args4j parent args4j: Java command line arguments parser. Prepare your environment Because we only want to have a very small example, we use only one single directory containing all the stuff— sources, class files and the args4j jarfile.
Create a directory args4j-sample this will be our project directory. Download the latest args4j version from the download page Extract the args4j- version. Implementing pure business logic Create the business bean Business. Start the class Now we have three options for setting the field from the command line: Start the class java -classpath. Starter -name "Hrld" -file args4j Adding Args4J Annotations Well, we don't have any annotations to handle the command line parameters yet.
Sets a file if that is present -name VAL: Enhancing the parsing If you want to have more control over parsing and error handling, don't use the starter. Here are the main steps: