Generate Harmonic Series example in java

class HarmonicSeries

   {

     public static void main(String args[])

     {

       int num = Integer.parseInt(args[0]);

       double result = 0.0;

       while(num > 0)

       {

         result = result + (double) 1 / num;

         num--;

       }

       System.out.println("Output of Harmonic Series is "+result);

     }

   }