Java Program on Reading Directories

      class DirList
   {
     public static void main(String args[])
     {
       String dirname = "/java";
       File f1 = new File(dirname);
       if (f1.isDirectory())
       {
         System.out.println( "Directory of " + dirname);
         String s[] = f1.list();
         for (int i=0; i < s.length; i++)
         {
           File f = new File(dirname + "/" + s[i]);
           if (f.isDirectory())
           {
             System.out.println(s[i] + " is a directory");
           }
           else
           {
             System.out.println(s[i] + " is a file");
           }
         }
       }
       else
       {
         System.out.println(dirname + " is not a directory");
       }
     }
   }