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This is utility classes used by my other projects.
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/*
 * Copyright 2002-2016 Jalal Kiswani.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jk.util;

import java.text.DecimalFormat;

/**
 * The Class NumbersToWords.
 *
 * @author Jalal Kiswani
 */
public class NumbersToWords {
	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" };

	/**
	 * Convert.
	 *
	 * @param number
	 *            the number
	 * @return the string
	 */
	public static String convert(final long number) {
		// 0 to 999 999 999 999
		if (number == 0) {
			return "zero";
		}

		String snumber = Long.toString(number);

		// pad with "0"
		final String mask = "000000000000";
		final DecimalFormat df = new DecimalFormat(mask);
		snumber = df.format(number);

		// XXXnnnnnnnnn
		final int billions = Integer.parseInt(snumber.substring(0, 3));
		// nnnXXXnnnnnn
		final int millions = Integer.parseInt(snumber.substring(3, 6));
		// nnnnnnXXXnnn
		final int hundredThousands = Integer.parseInt(snumber.substring(6, 9));
		// nnnnnnnnnXXX
		final int thousands = Integer.parseInt(snumber.substring(9, 12));

		String tradBillions;
		switch (billions) {
		case 0:
			tradBillions = "";
			break;
		case 1:
			tradBillions = convertLessThanOneThousand(billions) + " Billion ";
			break;
		default:
			tradBillions = convertLessThanOneThousand(billions) + " Billion ";
		}
		String result = tradBillions;

		String tradMillions;
		switch (millions) {
		case 0:
			tradMillions = "";
			break;
		case 1:
			tradMillions = convertLessThanOneThousand(millions) + " Million ";
			break;
		default:
			tradMillions = convertLessThanOneThousand(millions) + " Million ";
		}
		result = result + tradMillions;

		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;

		// remove extra spaces!
		final String replaceAll = result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " ");
		return replaceAll.trim();
		// return replaceAll.replace(" ", "_");
	}

	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;
	}

	/**
	 * The main method.
	 *
	 * @param args
	 *            the arguments
	 */
	public static void main(final String[] args) {
		System.err.println(NumbersToWords.convert(45233));
	}
}