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Creates an object from its specific subclass. Q: How can it be realized? Answer: To create abstract classes derived from factories, that is, specific factories create specific products. Since products are to be created, product abstract classes and specific product classes are naturally needed.故事发生在解放前后。郑琛、李乃强和朱润是广东潮州同乡的好兄弟，郑琛父亲是当地殷实的商人，郑家在当地有着非常高的声望。少年郑琛就已经显示出了过人的谋略和胆识，十年潮州一带土匪作乱，郑琛用计吓跑了他们，随后更是主持公道，化解了上莲村、下莲村之间的恩怨。解放后，他和李乃强、朱润一起来到了香港闯天下。初到香港，三人穷得叮当响，但是他们并不灰心，而是开始了由低做起，一步一个脚印，在经历了一连串了风风雨雨后，三人都获得了巨大的成功，郑琛成了香港的制衣业龙头，刚正不阿的李乃强在经过廉政风暴后终于在警界站稳了脚跟，朱润则成了连锁饮食业巨头。他们的奋斗历史也印证了香港的发展。The above is the specific process of three handshakes. Seeing here, you may have a question. Usually we only call when establishing a connection with the server, and we do not shake hands three times. In fact, this high-level concept is an abstraction of the three-time handshake, and its concrete implementation completes the three-time handshake process.“人类爱上吸血鬼！”Big Brother Strong Invincible Ben Meng Xin Has Been Dizzy铤而走险不假，却也不是无的放矢。Let's look at a code example first: