java 数字转英文

package com.ls.it.day4;


public class NumberParser {


public static void main(String[] args) {

System.out.println( NumberParser.parse("123456789"));

}


public static String parse(String x) {

int z = x.indexOf("."); // 取小数点位置

String lstr = "", rstr = "";

if (z > -1) { // 看是否有小数，如果有，则分别取左边和右边

lstr = x.substring(0, z);

rstr = x.substring(z + 1);

} else // 否则就是全部

lstr = x;


String lstrrev = reverse(lstr); // 对左边的字串取反

String[] a = new String[5]; // 定义5个字串变量来存放解析出来的叁位一组的字串


switch (lstrrev.length() % 3) {

case 1 :

lstrrev += "00";

break;

case 2 :

lstrrev += "0";

break;

}

String lm = ""; // 用来存放转换後的整数部分

for (int i = 0; i < lstrrev.length() / 3; i++) {

a[i] = reverse(lstrrev.substring(3 * i, 3 * i + 3)); // 截取第一个叁位

if (!a[i].equals("000")) { // 用来避免这种情况：1000000 = one million thousand only

if (i != 0)

lm = transThree(a[i]) + " " + parseMore(String.valueOf(i)) + " " + lm; // 加: thousand、million、billion

else

lm = transThree(a[i]); // 防止i=0时， 在多加两个空格.

} else

lm += transThree(a[i]);

}


String xs = ""; // 用来存放转换後小数部分

if (z > -1)

xs = "AND CENTS " + transTwo(rstr) + " "; // 小数部分存在时转换小数


//return lm.trim() + " " + xs + "ONLY";

return lm.trim() + " " + xs ;

}


private static String parseFirst(String s) {

String[] a =

new String[] { "", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE" };

return a[Integer.parseInt(s.substring(s.length() - 1))];

}


private static String parseTeen(String s) {

String[] a =

new String[] {

"TEN",

"ELEVEN",

"TWELEVE",

"THIRTEEN",

"FOURTEEN",

"FIFTEEN",

"SIXTEEN",

"SEVENTEEN",

"EIGHTEEN",

"NINETEEN" };

return a[Integer.parseInt(s) - 10];

}


private static String parseTen(String s) {

String[] a =

new String[] {

"TEN",

"TWENTY",

"THIRTY",

"FORTY",

"FIFTY",

"SIXTY",

"SEVENTY",

"EIGHTY",

"NINETY" };

return a[Integer.parseInt(s.substring(0, 1)) - 1];

}


// 两位

private static String transTwo(String s) {

String value = "";

// 判断位数

if (s.length() > 2)

s = s.substring(0, 2);

else if (s.length() < 2)

s = "0" + s;


if (s.startsWith("0")) // 07 - seven 是否小於10

value = parseFirst(s);

else if (s.startsWith("1")) // 17 seventeen 是否在10和20之间

value = parseTeen(s);

else if (s.endsWith("0")) // 是否在10与100之间的能被10整除的数

value = parseTen(s);

else

value = parseTen(s) + " " + parseFirst(s);

return value;

}


private static String parseMore(String s) {

String[] a = new String[] { "", "THOUSAND", "MILLION", "BILLION" };

return a[Integer.parseInt(s)];

}


// 制作叁位的数

// s.length = 3

private static String transThree(String s) {

String value = "";

if (s.startsWith("0")) // 是否小於100

value = transTwo(s.substring(1));

else if (s.substring(1).equals("00")) // 是否被100整除

value = parseFirst(s.substring(0, 1)) + " HUNDRED";

else

value = parseFirst(s.substring(0, 1)) + " HUNDRED AND " + transTwo(s.substring(1));

return value;

}


private static String reverse(String s) {

char[] aChr = s.toCharArray();

StringBuffer tmp = new StringBuffer();

for (int i = aChr.length - 1; i >= 0; i--) {

tmp.append(aChr[i]);

}

return tmp.toString();

}

}