Java 手機號碼格式化爲182****5716

/** 
     * 手機號碼格式化微182****5716 
     * 
     * @param phone 
     * @return 
     */ 
    public static String phoneNumberFormat(String phone) { 
        String reStr = phone.substring(phone.length() - 4, phone.length()); 
        String preStr = phone.substring(0, phone.length() - 9); 
        StringBuilder sb = new StringBuilder(); 
        sb.append(preStr).append("****").append(reStr); 
        return sb.toString(); 

    }

   /**
     * 銀行帳號格式化
     * 
     * @param str
     * @return
     */
    public static String getSubString(String str) {
        String reStr = str.substring(str.length() - 4, str.length());
        return "尾號" + reStr;
    }