Number to words

package com.nmmc.common.utils;

import java.text.DecimalFormat;

public class NumberToWords
{

    private static final String[] tensNames = { "", " ten", " twenty", " thirty", " forty", " fifty", " sixty", " seventy", " eighty", " ninety" };

    private static final String[] numNames = { "", " one", " two", " three", " four", " five", " six", " seven", " eight", " nine", " ten", " eleven", " twelve", " thirteen", " fourteen", " fifteen",
        " sixteen", " seventeen", " eighteen", " nineteen" };

    private static String convertLessThanOneThousand(int number)
    {
    String soFar;

    if (number % 100 < 20)
    {
        soFar = numNames[number % 100];
        number /= 100;
    } else
    {
        soFar = numNames[number % 10];
        number /= 10;

        soFar = tensNames[number % 10] + soFar;
        number /= 10;
    }
    if (number == 0)
        return soFar;
    return numNames[number] + " hundred" + soFar;
    }

    public static String convert(double number)
    {
    // 0 to 999 999 999 999
    if (number == 0)
    {
        return "zero";
    }

    String snumber = Double.toString(number);

    // pad with "0"
    String mask = "000000000000.00";
    DecimalFormat df = new DecimalFormat(mask);
    snumber = df.format(number);

    int crore = Integer.parseInt(snumber.substring(0, 5));
    int lakhs = Integer.parseInt(snumber.substring(5, 7));
    int hundredThousands = Integer.parseInt(snumber.substring(7, 9));
    int thousands = Integer.parseInt(snumber.substring(9, 12));
    int paise = Integer.parseInt(snumber.substring(13, 15));

    String tradCrores;
    switch (crore)
    {
    case 0:
        tradCrores = "";
        break;
    case 1:
        tradCrores = convertLessThanOneThousand(crore) + " crore ";
        break;
    default:
        tradCrores = convertLessThanOneThousand(crore) + " crores ";
    }
    String result = tradCrores;

    String tradLakhs;
    switch (lakhs)
    {
    case 0:
        tradLakhs = "";
        break;
    case 1:
        tradLakhs = convertLessThanOneThousand(lakhs) + " lakh ";
        break;
    default:
        tradLakhs = convertLessThanOneThousand(lakhs) + " lakhs ";
    }
    result = result + tradLakhs;

    String tradHundredThousands;
    switch (hundredThousands)
    {
    case 0:
        tradHundredThousands = "";
        break;
    case 1:
        tradHundredThousands = "one thousand ";
        break;
    default:
        tradHundredThousands = convertLessThanOneThousand(hundredThousands) + " thousand ";
    }
    result = result + tradHundredThousands;

    String tradThousand;
    tradThousand = convertLessThanOneThousand(thousands);
    result = result + tradThousand;

    String tradPaise;
    switch (paise)
    {
    case 0:
        tradPaise = "";
        break;
    case 1:
        tradPaise = convertLessThanOneThousand(paise) + " paise ";
        break;
    default:
        tradPaise = convertLessThanOneThousand(paise) + " paise ";
    }
    result = result + tradPaise;
    // remove extra spaces!
    return result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " ");
    }

    public static void main(String args[]){
    System.out.println(NumberToWords.convert(999999999.455));
    }
}