main method argument!!!

[Seetharaman Venkatasamy]

Hi All,

why we always giving String arg[] in main method

can any one tell me?

Thanks & Regards,
seetharaman.v

[Seetharaman Venkatasamy]

one more question

how many times the finalize will call ?

[Paul Sturrock]

So you can pass arguments to your program. Try writing a basic app, somehting like:

public class TestApp {
 
   public static void main(Strign [] args) {
       if (args != null) {
           for (int i = 0; i < args.length; i++) {
               System.out.println(args[i]);
           }
       }
   }
 
}
 

and run it with some parameters (e.g. "java TestApp foo bar "), see what it does.
[ May 27, 2008: Message edited by: Paul Sturrock ]

[amitabh mehra]

Originally posted by seetharaman venkatasamy:
one more question

how many times the finalize will call ?

never more than once for any object

[Seetharaman Venkatasamy]

Paul Sturrock ,


i mean..

why we can not give like this

public static void main(int[] args){}

we always used to give public static void main(String[] args){} why?

[Ulf Dittmer]

There's no guarantee that you'll get something that fits an "int" from the command line. Strings, on the other words, can be used for anything you can type on the command line.

[Seetharaman Venkatasamy]

THANKS ULF

[K Sathya Narayanan]

hi
even you can use
public static void main(){}//complies ok instead of public static void main(String[] args){}

but when you try to execute it will result in a runtime exception.
The complier expects the main() method to have the following attributes
1 must be public and static,the order in which it is typed is not a error

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

2. must return void as return type and have a string[] as argument
as of java 5. , you can use main(String...data) instead main(String[] data)

The String[] passed in the main function delas with the command line arguments. so you may overload the main function , but the main function with the above attributes only will be called by the compiler. even if the program may not use the command line arguments but still string[] must be passed as argument.

HTH
K Sathya Narayanan

[vinayak katkar]

hi
arguments given to the main are called as command line arguments
when we want to give the file name,string name at the runtime we use the command line argument .