使用逗号按位数对数字进行分割输出

/**
     * 使用逗号按位数对数字进行分割输出
     * @param num
     * @param seperateBit
     * @return
     */
    public static String spilitNUm(long num, int seperateBit){
        if (seperateBit<0){
            return null;
        }
        String s = String.valueOf(num);
        ArrayList<Character> characters = new ArrayList<>();
        for (int i = 0; i < s.length(); i++) {
            characters.add(s.charAt(i));
        }
        int count=0;
        StringBuilder stringBuilder = new StringBuilder();
        int countIndex=0;
        for (Character character : characters) {
            int i = count + 1;
            if (i<seperateBit){
                if (!(i%seperateBit==0)){
                    stringBuilder.append(character);
                    count++;
                    countIndex++;
                    if (s.length()==(countIndex+1)){
                        break;
                    }
                    continue;
                }else {
                    stringBuilder.append(",");
                    count-=seperateBit;
                    continue;
                }
            }else {
                i-=1;
                if (!(i%seperateBit==0)){
                    stringBuilder.append(character);
                    count++;
                    countIndex++;
                    if (s.length()==(countIndex+1)){
                        break;
                    }
                    continue;
                }else {
                    stringBuilder.append(",");
                    count-=seperateBit;
                    continue;
                }
            }
        }
        String string = stringBuilder.toString();
        return string;
    }