Parsing Command-Line Arguments
In this phrase, we store the values of three command line arguments into three separate string variables, arg1, arg2, and arg3. Any java class can have a main() method, which is executable from the command line. The main() method accepts a String array of command-line arguments. The arguments are contained in the array in the order in which they are entered at the command line. So, to retrieve the command-line arguments, you simply have to extract the elements of the arguments array passed into the main() method. If your application uses a lot of command-line arguments, it is wise to spend the time to write a custom command-line arguments parser to understand and handle various types of command-line arguments, such as single-character parameters, parameters that being with a dash (-), parameters that are immediately followed by another related parameter, and so on. Note Online, you can find many good examples of command-line argument processors to save you a lot of work. Here are two good libraries that can get you started:
Both of these are small libraries that can parse complex command-line arguments through a relatively simple interface. |
