public class TestCase {
    public static void main(String[] args) {
        switch(args.length) {
            case 0:
                System.out.println("No arguments");

            case 1:
                System.out.println("One argument");

            case 2:
                System.out.println("Two arguments");

            default:
                System.out.println("The default");
        }
    }
}

C:\tmp>java TestCase
No arguments
One argument
Two arguments
The default

C:\tmp>java TestCase 1
One argument
Two arguments
The default

C:\tmp>