multiple classes and mains in java

save as "multiplemain.java"
========================================
class a
{
public static void main(String args[])
{
System.out.println("i am in class a");
}
}
class b
{
public static void main(String args[])
{
System.out.println("i am in class b");
}
}

class c
{
public static void main(String args[])
{
System.out.println("i am in class c");
}
}

=============================================
how to run :
by default "class a" will run
so , output is " i am in class a"

to run any class , open command prompt and run as fallows

start  > run > type "cmd" > open the directory in command prompt where java installed and your java program is stored within java programs

And type as fallows

javac  multiplemain.java (press enter)
java a (press enter)
or
java b (press enter)
or
java c  (press enter)

=============================================
ex ample :

   C:\Program Files\Java\jdk1.6.0_07\bin\javac  multiplemain.java  (press enter)

   C:\Program Files\Java\jdk1.6.0_07\bin\java a  (press enter)
    or
   C:\Program Files\Java\jdk1.6.0_07\bin\java b  (press enter)
    or
   C:\Program Files\Java\jdk1.6.0_07\bin\java c  (press enter)

=============================================

output :

i am in a
or
i am in b
or
i am in c