converting strings to double and finding sum of the same

sum of array

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

///////////////////
// FifthJava.java
// 
// javac FifthJava.java
//
// produces FifthJava.class
//
// To execute 
// ----------
// java FifthJava < list of arguments>
// 
//
//
//



public class FifthJava
{

  public static void main(String[] args)
  {
        //
  // retreive the number of arguments
   int n = args.length;
   System.out.println(n); 
  //
  // declare a double array (vector)  
  double [] arr = new double[n];
  //
  // converting strings into double array
  for(int i = 0;i < n;i++) {
    arr[i] = Double.parseDouble(args[i]);
  }
  //
  // computing the sum of the contents of double array
  double sum = 0;
  int k = 0;
  while (k < n) {
    sum = sum + arr[k];
                 k = k+1;
  }
  //
  // printing the sum
  System.out.println(sum);
  }



}