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The source code is released under:
GNU General Public License
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package com.obihann.swear; /*from w ww. java2s . c o m*/ import java.text.DecimalFormat; public class EnglishNumberToWords { 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 EnglishNumberToWords() {} 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(long number) { // 0 to 999 999 999 999 if (number == 0) { return "zero"; } String snumber = Long.toString(number); // pad with "0" String mask = "000000000000"; DecimalFormat df = new DecimalFormat(mask); snumber = df.format(number); // XXXnnnnnnnnn int billions = Integer.parseInt(snumber.substring(0,3)); // nnnXXXnnnnnn int millions = Integer.parseInt(snumber.substring(3,6)); // nnnnnnXXXnnn int hundredThousands = Integer.parseInt(snumber.substring(6,9)); // nnnnnnnnnXXX 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! return result.replaceAll("^\\s+", "").replaceAll("\\b\\s{2,}\\b", " "); } }