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  • java处理银行卡号格式(每四位添加空格)

    /**
         * desc: 处理银行卡号格式
         * @param bankCardNum
         * @return {@link String}
        */
        private String handleBankCardNum(String bankCardNum) {
            String bankCardStr = "";
            if (StringUtil.isNotBlank(bankCardNum)) {
                bankCardStr = handleBankCard(bankCardNum);
            }
            return bankCardStr;
        }
    
        private String handleBankCard(String bankCardNum) {
            String str = "";
            if (StringUtil.isNotBlank(bankCardNum)) {
                if (bankCardNum.length() >= 4) {
                    str = bankCardNum.substring(0, 4) + " ";
                    String substring = bankCardNum.substring(4);
                    str += handleBankCard(substring);
                } else {
                    str += bankCardNum;
                }
            }
            return str;
        }
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  • 原文地址:https://www.cnblogs.com/stromgao/p/15394257.html
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