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();
}
}
