why public for main

["amroz kamal siddiqui" <kamalamroz at rediffmail dot com>]

hello friends out there,
          Iam  a newbie in java, I just have a simple and a 
very
annoying ( at least to me ) question.  Why do we use the keyword
public for the main method ?
eg.
    public static void main(String arg[])


Actually the problem is that, it works even if I don't use 
public.
In fact it works if I use private like
    private static void main(String arg[])
only removing static does not work.
Thus,
  all the following works,


    public static void main(String arg[])

    private static void main(String arg[])

    static void main(String arg[])


but the following does not work,


    void main(String arg[])

################    WHY   #####################


please help

Amroz


Siddiqui Amroz Kamal
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