Java, A Beginner's Guide, 5th Edition, 5th Edition

Using Command-Line Arguments

Now that you know about the String class, you can understand the args parameter to main( ) that has been in every program shown so far. Many programs accept what are called command-line arguments. A command-line argument is the information that directly follows the program’s name on the command line when it is executed. To access the command-line arguments inside a Java program is quite easy—they are stored as strings in the String array passed to main( ). For example, the following program displays all of the command-line arguments that it is called with:

If CLDemo is executed like this,

you will see the following ...