[Eranga]

Cool, I give the first point. In any class main method is the stating point. If any of your class doesn't have a main method, that me you can't run that class, because you don't have a starting point to directed to the Java Runtime Environment.

Since to run a class each one of it have a main method, which should be a static one. So that JVM initialize only one main method for a class, until it reaches to the end.

So your main method should like this.

public static void main(String[] args) {
    // Your implementation goes here
}