Money converter

Moneyconvert.java

    public static String formatFen2Yuan2(long amt) {
        boolean neg = false;
        if(amt < 0) {
            neg = true;
            amt = -amt;
        }
        long left = amt / 100L;
        long right = amt % 100L;

        StringBuilder sb = new StringBuilder();
        if(neg) {
            sb.append("-");
        }
        sb.append(NumberFormat.getNumberInstance(Locale.US).format(left));
        sb.append(".");
        if(right < 10) {
            append0(sb, 1);
        }
        sb.append(right);
        return sb.toString();
    }


    public static long formatYuan2Fen2(String yuan) {
        return rightMovePoint(yuan, 2);
    }

//    public static long yuan2Li(String yuan) {
//        return rightMovePoint(yuan, 3);
//    }

    private static long rightMovePoint(String origin, int offset) {
        if(StringUtils.isEmpty(origin))
            return 0;

        String t = origin.replace(",", "");
        StringBuilder sb = new StringBuilder(t);
        int pntIndex = sb.indexOf(".");
        int len = sb.length();
        if(pntIndex == -1) {
            append0(sb, offset);
        }
        else if(len - pntIndex > offset) {
            sb.delete(pntIndex + offset + 1, len);
            sb.deleteCharAt(pntIndex);
        }
        else {
            append0(sb, offset + 1 + pntIndex - len);
            sb.deleteCharAt(pntIndex);
        }
        return Long.valueOf(sb.toString());
    }

    private static StringBuilder append0(StringBuilder sb, int count) {
        for(int i = 0; i < count; i++)
            sb.append("0");
        return sb;
    }