Convert numbers in to words (Java)

Convert numbers in to words (Java)

Short and sweet?

http://www.daniweb.com/software-development/java/threads/67369/page2

    /** Holds the number 1-19, dual purpose for special cases (teens) **/
    private static final String[] UNITS = {"one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
    /** Holds the tens places **/
    private static final String[] TENS = {"ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninty"};
    /** Covers max value of Long **/
    private static final String[] THOUSANDS = {"", "thousand", "million", "billion", "trillion", "quadrillion", "quintillion", "sextillion"};
 
    /**
     * Represents a number in words (seven hundred thirty four, two hundred and seven, etc...)
     *
     * The largest number this will accept is
     * 
999,999,999,999,999,999,999
but that's okay becasue the largest
     * value of Long is 
9,223,372,036,854,775,807
. The smallest number
     * is 
-9,223,372,036,854,775,807
(Long.MIN_VALUE +1) due to a
     * limitation of Java.
     * @param number between Long.MIN_VALUE and Long.MAX_VALUE
     * @return the number writen in words
     */
    public static String numberInWords(long number) {
        StringBuilder sb = new StringBuilder();
        // Zero is an easy one, but not technically a number :P
        if (number == 0) {
            return "zero";
        }
        // Negative numbers are easy too
        if (number < 0) {
            sb.append("negative ");
            number = Math.abs(number);
        }
 
        // Log keeps track of which Thousands place we're in
        long log = 1000000000000000000L, sub = number;
        int i = 7;
        do {
            // This is the 1-999 subset of the current thousand's place
            sub = number / log;
            // Cut down number for the next loop
            number = number % log;
            // Cut down log for the next loop
            log = log / 1000;
            i--; // tracks the big number place
            if (sub != 0) {
                // If this thousandths place is not 0 (that's okay, just skip)
                // tack it on
                sb.append(hundredsInWords((int) sub));
                sb.append(" ");
                sb.append(THOUSANDS[i]);
                if (number != 0) {
                    sb.append(" ");
                }
            }
        } while (number != 0);
 
        return sb.toString();
    }
 
    /**
     * Converts a number into hundreds.
     *
     * The basic unit of the American numbering system is "hundreds". Thus
     * 1,024 = (one thousand) twenty four
     * 1,048,576 = (one million) (fourty eight thousand) (five hundred seventy six)
     * so there's no need to break it down further than that.
     * @param n between 1 and 999
     * @return
     */
    private static String hundredsInWords(int n) {
        if (n < 1 || n > 999) {
            throw new AssertionError(n); // Use assersion errors in private methods only!
        }
        StringBuilder sb = new StringBuilder();
 
        // Handle the "hundred", with a special provision for x01-x09
        if (n > 99) {
            sb.append(UNITS[(n / 100) - 1]);
            sb.append(" hundred");
            n = n % 100;
            if (n != 0) {
                sb.append(" ");
            }
            if(n < 10){
                sb.append("and ");
            }
        }
 
        // Handle the special cases and the tens place at the same time.
        if (n > 19) {
            sb.append(TENS[(n / 10) - 1]);
            n = n % 10;
            if (n != 0) {
                sb.append(" ");
            }
        }
 
        // This is the ones place
        if (n > 0) {
            sb.append(UNITS[n - 1]);
        }
        return sb.toString();
    }