Java™ How to Program, Seventh Edition

7.12. Using Command-Line Arguments

On many systems it is possible to pass arguments from the command line (these are known as command-line arguments) to an application by including a parameter of type String[] (i.e., an array of Strings) in the parameter list of main, exactly as we have done in every application in the book. By convention, this parameter is named args. When an application is executed using the java command, Java passes the command-line arguments that appear after the class name in the java command to the application’s main method as Strings in the array args. The number of arguments passed in from the command line is obtained by accessing the array’s length attribute. For example, the command "java MyClass a b" passes two command-line ...