Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:
Before SSL data transmission, both communication parties need to shake hands with SSL, negotiate encryption algorithm to exchange encryption keys, and carry out identity verification. Usually such SSL only needs one time, but there is a Renegotiation option in SSL protocol, through which the secret key can be renegotiated to establish a new secret key.
First, unify the interfaces:
/sob (crying)
果然，张槐白了儿子一眼，搬了个凳子挨在郑氏身边坐下。
Chapter 9 Creating a New World with Deliberate Practice
当晚是八月十五，永平帝在乾阳殿大排筵席，宴请各国使臣。
Website 2: http://www.itpub.net/tree/index_105_1/( This is the general directory of MSSQLServer issues)
小葱笑道：对。
或许正是因为这个原因，使得越国地方势力有了一众错觉，以为他越王尹旭好欺负，难道真是老虎不发威就当成病猫了？越王尹旭对此十分生气，今日正好遇见这样的事情，所以索xìng拿此事来立威。
虽说没有许负，自己也曾派了蒲俊去救李玉娘，但是能否成功还两个字。
瑪波小姐來到英國的小鎮，穿梭於過去與現在，為富家小姐Gwenda破解一個浮現在幻覺中的謎團。Gwenda自從遷到英國一間大屋居住後，就經常在夜深人靜時看見一幕幕驚心動魄的謀殺片段。神探瑪波小姐相助Gwenda查案，經過與不同人物交談及詳細調查後，瑪波小姐終為Gwenda查出一宗在她童年時目擊的謀殺案真相，Gwenda更因而發現一些自己早已被遺忘的童年往事……
亿万富翁江建国的女儿江离在结婚的这一天早晨，逃婚了。满心以为是心爱的人来带她私奔，却不料拥抱迎来的确实锋利的刀刃。被谋杀的江离被天使唤醒，却找不到生前记忆无法转世投胎。为了寻回记忆找到凶手，天使空空给了江离七天的时间。这七天内，江离站在一旁，重新审视了一遍自己的人生……
Group B is the same as group A;
讲述了1937年7月7日中国抗日战争全面爆发后，三个不同出身姑娘在民族存亡关头，毅然走上前线，肩负起抗日救亡的重任；在解放战争中，她们巾帼不让须眉，带领后方广大妇女筹集干粮赶做军鞋，运送粮食、和军需物资，积极支援解放前线。
In the above story, it can be seen that it is a typical publishing and subscribing mode. The seller belongs to the publisher, and Xiao Hong and Xiao Ming belong to the subscriber. Subscribe to the store. As the publisher, the seller will notify Xiao Ming and Xiao Hong in turn when the shoes arrive, and use Wang Wang and other tools to publish news to them in turn.
正是因为种种限制因素，巨鹿之战不能拖的太久。
这事怎么办？郑氏问道。
