java 阿拉伯数字转英文（包含小数）
首先是整数转英文
package com.newcoder;
/*Task: 英文和阿拉伯数字之间的转换
*
* Date:2014.02.24
*
* */
import java.util.HashMap;
import java.util.Scanner;
public class numToEnlish {
public static final String ZERO = "zero";
public static final String NEGATIVE = "negative";
public static final String SPACE = " ";
public static final String MILLION = "million";
public static final String THOUSAND = "thousand";
public static final String HUNDRED = "hundred";
public static final String[] INDNUM = {"zero", "one", "two", "three", "four", "five", "six",
"seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen",
"fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};
public static final String[] DECNUM = {"twenty", "thirty", "forty", "fifty", "sixty",
"seventy", "eighty", "ninety"};
//数字转换英文
public String format(int i) {
StringBuilder sb = new StringBuilder();
if(i == 0) {
return ZERO;
}
if(i < 0) {
sb.append(NEGATIVE).append(SPACE);
i *= -1;
}
if(i >= 1000000) {
sb.append(numFormat(i / 1000000)).append(SPACE).append(MILLION).append(SPACE);
i %= 1000000;
}
if(i >= 1000) {
sb.append(numFormat(i / 1000)).append(SPACE).append(THOUSAND).append(SPACE);
i %= 1000;
}
if(i < 1000){
sb.append(numFormat(i));
}
return sb.toString();
}
// 3位数转英文
public String numFormat(int i) {
StringBuilder sb = new StringBuilder();
if(i >= 100) {
sb.append(INDNUM[i / 100]).append(SPACE).append(HUNDRED).append(SPACE);
}
i %= 100;
if(i != 0) {
if(i >= 20) {
sb.append(DECNUM[i / 10 -2]).append(SPACE);
if(i % 10 != 0) {
sb.append(INDNUM[i % 10]);
}
}else {
sb.append(INDNUM[i]);
}
}
return sb.toString();
}
//英文转数字
public int parse(String str) {
HashMap hm = new HashMap();
hm.put("zero", 0);
hm.put("one", 1);
hm.put("two", 2);
hm.put("three", 3);
hm.put("four", 4);
hm.put("five", 5);
hm.put("six", 6);
hm.put("seven", 7);
hm.put("eight", 8);
hm.put("nine", 9);
hm.put("ten", 10);
hm.put("eleven", 11);
hm.put("twelve", 12);
hm.put("thirteen", 13);
hm.put("fourteen", 14);
hm.put("fifteen", 15);
hm.put("sixteen", 16);
hm.put("seventeen", 17);
hm.put("eighteen", 18);
hm.put("nineteen", 19);
hm.put("twenty", 20);
hm.put("thirty", 30);
hm.put("forty", 40);
hm.put("fifty", 50);
hm.put("sixty", 60);
hm.put("seventy", 70);
hm.put("eighty", 80);
hm.put("ninety", 90);
hm.put("hundred", 100);
hm.put("thousand", 1000);
hm.put("million", 1000000);
int i = 0;
int b = 0;
int c = 0;
String[] k = str.split(" ");
for (String string : k) {
if("hundred".equals(string)){
i *= hm.get("hundred");
}else if("thousand".equals(string)){
b = i;
b *= hm.get("thousand");
i = 0;
}else if("million".equals(string)){
c = i;
c *= hm.get("million");
i = 0;
}else if("negative".equals(string)){
i = 0;
}else {
i += hm.get(string);
}
}
i += c + b;
for (String string2 : k) {
if("negative".equals(string2)){
i = -i;
}
}
return i;
}
public static void main(String[] args) {
// NumberWordFormat nwf = new NumberWordFormat();
// System.out.println(nwf.format(1432008));
// int i = nwf.parse("one million four hundred thirty two thousand eight");
// System.out.println("i="+i);
numToEnlish numberWordFormat = new numToEnlish();
Boolean flag = false;
Scanner sc = new Scanner(System.in);
try {
do {
System.out.println("请选择format还是parse，format输入1，parse输入2");
String input = sc.nextLine();
if("1".equals(input)){
System.out.println("您选择了format，请输入数字 （注：范围在999999999和-999999999之间）:");
input = sc.nextLine();
int num = Integer.parseInt(input);
if(num > 999999999 || num< -999999999 || input.length() > String.valueOf(num).length()){
throw new NumberFormatException();
}
System.out.println("转换结果为： " + numberWordFormat.format(num));
}else if("2".equals(input)){
System.out.println("您选择了parse，请输入英文数字,注意格式（每输入一个单词后一空格）:");
input = sc.nextLine();
try {
System.out.println("转换结果为： " + numberWordFormat.parse(input));
} catch (Exception e) {
System.out.println("请输入正确的英文单词及格式!!重新输入!!");
}
}else {
System.out.println("输入错误，请重新输入！！");
}
System.out.println("是否继续？");
input = sc.nextLine();
if("Y".equalsIgnoreCase(input)){
flag = true;
}else {
flag = false;
}
} while (flag);
} finally {
sc.close();
}
}
}
然后是小数后面的英文转换，最后一整合。
package com.newcoder;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class splitNum {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double num = scanner.nextDouble();
String numStr = String.valueOf(num);
String numResult = "";
numToEnlish numberWordFormat = new numToEnlish();
numStr = subZeroAndDot(numStr);
if (isInteger(numStr)) {
// 整数
int integer = Integer.parseInt(numStr);
numStr = numberWordFormat.format(integer);
System.out.println(numStr);
} else {
// 拆分成两部分，整数部分和小数部分
String integerNum = splitInteger(num);
int integer = Integer.parseInt(integerNum);
numStr = numberWordFormat.format(integer);
String decimalNum = splitNum(num);
String decimal = decimalToEnlish(decimalNum);
numResult = numStr + " point " + decimal;
System.out.println(numResult + "");
}
}
/**
* 小数部分转换成英文
*
*/
public static String decimalToEnlish(String decimalNum) {
String[] enlishNum = { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
String decimal = "";
int num = Integer.parseInt(decimalNum);
int numLength = decimalNum.length();
int[] numArr = new int[numLength];
for (int i = 0; i < numLength; i++) {
numArr[i] = (int) (num / (Math.pow(10, numLength - 1 - i)));
num = (int) (num % (Math.pow(10, numLength - 1 - i)));
if (numArr[i] == 0) {
decimal += enlishNum[0] + " ";
} else if (numArr[i] == 1) {
decimal += enlishNum[1] + " ";
} else if (numArr[i] == 2) {
decimal += enlishNum[2] + " ";
} else if (numArr[i] == 3) {
decimal += enlishNum[3] + " ";
} else if (numArr[i] == 4) {
decimal += enlishNum[4] + " ";
} else if (numArr[i] == 5) {
decimal += enlishNum[5] + " ";
} else if (numArr[i] == 6) {
decimal += enlishNum[6] + " ";
} else if (numArr[i] == 7) {
decimal += enlishNum[7] + " ";
} else if (numArr[i] == 8) {
decimal += enlishNum[8] + " ";
} else if (numArr[i] == 9) {
decimal += enlishNum[9] + " ";
}
}
return decimal;
}
/**
* 取出整数部分
*/
public static String splitInteger(double num) {
String str = String.valueOf(num);
String result = str.substring(0, str.indexOf('.'));
return result;
}
/**
* 取出小数部分
*/
public static String splitNum(double num) {
String str = String.valueOf(num);
String result = str.substring(str.indexOf('.') + 1);
return result;
}
/**
* 功能：检查请求isInteger方法的参数是否为整数
*
* @param str
* String
* @return 返回boolean类型，false表示不是整数，true表示是整数
*/
public static boolean isInteger(String str) {
int begin = 0;
if (str == null || str.trim().equals("")) {
return false;
}
str = str.trim();
if (str.startsWith("+") || str.startsWith("-")) {
if (str.length() == 1) {
return false;
}
begin = 1;
}
for (int i = begin; i < str.length(); i++) {
if (!Character.isDigit(str.charAt(i))) {
return false;
}
}
return true;
}
/**
* 使用java正则表达式去掉多余的.与0
*
* @param s
* @return
*/
public static String subZeroAndDot(String s) {
if (s.indexOf(".") > 0) {
s = s.replaceAll("0+?$", "");// 去掉多余的0
s = s.replaceAll("[.]$", "");// 如最后一位是.则去掉
}
return s;
}
}
