How to use public void handlerequest() throws ioexception after public static void main(string[] args)

I have :

  public static void main(String[] args) throws IOException {

 public void handleRequest(HttpServletRequest req , HttpServletResponse res ) throws IOException {
//my code here 
}
}

error in public void handleRequest() say the illegal start of the exception

public static void main(String[] args) throws IOException {

 public void handleRequest(HttpServletRequest req , HttpServletResponse res ) throws IOException {
//my code here 
}
}