main method

[eva]

Hi,

I am new to Java and new to this forum as well.

The signature of main method is

Code:

public static void main(String[] args) {
...
}

It takes a String array as input. But when I run the application, I do not supply any arguments to my application. Even then program runs fine. How this is done?

- PEACE

[hardwired]

The (java) virtual machine (jvm) will read the arguments that follow the ".java" on the command line and you can use these in the main method. If there are no arguments and/or if you do not use them it is okay. It's an option for input to an application. It is often used in a way that allows running an app with different paramaters/data without having to compile each time. If an app is designed to require arguments it usually will announce this in the console each time you run it without arguments.

[coe11n]

hardwired


what is the porpouse for _[]_ arrays in the main method

[hardwired]

You can enter more than one argument on the command line. The arguments will be treated as an array. "[]" is the array operator. "args" is (declared as) a String array.

[willemjav]

eva there is a real great book for beginners from david eck
( free on the net)
i just red it and it explains all
http://math.hws.edu/eck/cs124/downloads/javanotes5.pdf

willemjav

[eva]

Thanks hardwired for the explanation.
A big thanks to willemjav for the link.

- PEACE