java大写数字转小写数字 java小写数字转大写金额

public class Tool {
    
         private static final String UNIT = "万千佰拾亿千佰拾万千佰拾元角分";
         private static final String DIGIT = "零壹贰叁肆伍陆柒捌玖";
         private static final double MAX_VALUE = 9999999999999.99D;
         public static String change(double v) {
          if (v < 0 || v > MAX_VALUE){
              return "参数非法!";
          }
          long l = Math.round(v * 100);
          if (l == 0){
              return "零元整";
          }
          String strValue = l + "";
          // i用来控制数
          int i = 0;
          // j用来控制单位
          int j = UNIT.length() - strValue.length();
          String rs = "";
          boolean isZero = false;
          for (; i < strValue.length(); i++, j++) {
           char ch = strValue.charAt(i);
           if (ch == '0') {
            isZero = true;
            if (UNIT.charAt(j) == '亿' || UNIT.charAt(j) == '万' || UNIT.charAt(j) == '元') {
             rs = rs + UNIT.charAt(j);
             isZero = false;
            }
           } else {
            if (isZero) {
             rs = rs + "零";
             isZero = false;
            }
            rs = rs + DIGIT.charAt(ch - '0') + UNIT.charAt(j);
           }
          }
          if (!rs.endsWith("分")) {
           rs = rs + "整";
          }
          rs = rs.replaceAll("亿万", "亿");
          return rs;
         }
         
         public static void main(String[] args){
             System.out.println(Tool.change(12356789.9845));
         }
}