Java Code To Convert Integer To Word-Form

NumberToWord

package utilities.common;

import java.text.NumberFormat;
import java.util.Random;

import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import com.google.common.base.Joiner;

// Original Source URL:
// https://javahungry.blogspot.com/2014/05/convert-math-number-to-equivalent-readable-word-in-java-code-with-example.html
public class NumberToWords {
    private static final Logger logger = LogManager.getLogger(NumberToWords.class);

    private static final String[] specialNames = { "", " thousand,", " million,", " billion,",
            " trillio,n", " quadrillion,", " quintillion," };

    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 current;

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

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

    public static String convert(int number) {

        if (number == 0) {
            return "zero";
        }

        String prefix = "";

        if (number < 0) {
            number = -number;
            prefix = "Minus";
        }

        StringBuilder current = new StringBuilder();
        int place = 0;

        do {
            int n = number % 1000;
            if (n != 0) {
                String s = convertLessThanOneThousand(n);
                current.insert(0, s + specialNames[place]);
            }
            ++place;
            number /= 1000;
        } while (number > 0);
        
        String[] phrases = current.toString().split(" ");
        String[] newPhrase = new String[phrases.length];
        for (int i = 0; i < phrases.length; ++i)
            newPhrase[i] = StringUtils.capitalize(phrases[i]);
        String phrase = Joiner.on(" ").join(newPhrase);

        return (prefix + phrase).trim();
    }

    public static void main(String[] args) {
        Random r = new Random();
        int i = r.nextInt();
        String s = 
            String.format("\"%s\" is \"%s\"", NumberFormat.getInstance().format(i), convert(i));
        logger.info("{}", s);
    }

}