This program show me "int cannot be dereferenced" as error can you help me?

Question

public class Factorial{
     public static void main (String [] args){
          if (args.length<1){
               showmsg("a Integer Please");
               else if (args.length>1){
                    showmsg ("Only a Integer please");
                    else {
                         int n;
                         try {
                              n= Integer.parseInt(args[0]);
                         catch (NumberFormatException nfe){
                         showmsg ("a Integer not a String please"); //call to chow message method
                    factorial(n);
     //show a message
     private static void showmsg (String texto){
          System.out.println(texto);
     //factorial procedure
     public static void factorial (int n){
          int fac=1;
          for (int i=1;i<=n;i++){
               fac*=i;
          String resu = fac.toString();
          showmsg(resu);
}

Answer 1

Thanks for your help, I did change other lines too... (if some body wish Run)
try {
        int n;
        n= Integer.parseInt(args[0]);
        factorial(n);
catch (NumberFormatException nfe){
            //call to show message method
           showmsg ("a Integer not a String please");
           showmsg (nfe.getMessage());
}