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B) Design principles. Many people have listed seven principles, such as single duty principle, opening and closing principle, Richter substitution principle, dependence inversion principle, interface isolation principle, composite reuse principle and Dimit principle. LSP, I elevated it to one of the three cornerstones of the object-oriented paradigm; Single responsibility and interface isolation are mainly used as the principle of responsibility division in object-oriented analysis/OOA, which you can not pay much attention to at this time. Relying on the inversion principle, I throw it away as garbage, because the opening and closing principle or directly "relying on abstract type principle" already contains the essence of relying on the inversion principle, while the dross of relying on the inversion principle is inherited by IoC. Of course, the pullback, I emphasize very much. Therefore, you need to master the abstract dependency principle (OCP), one-way dependency principle (including the learning of callbacks) and the minimum dependency principle (composite reuse principle, Dimit rule).有匪君子，如金如锡，如圭如璧。7. As for the price, the purchase price given by the general hawker is: 8-12 yuan from April to May for unified goods. If sold separately, 234 is generally 6-8 yuan, more than 5 is generally more than 10 to 20 yuan, and in August 2013, unified goods are generally 17 and large specifications are about 25. This depends on the local actual situation and is not certain.然后重头戏来了，只见上面写道。After installation, there will be two jres, one inside the jdk and the other outside the jdk.剧集讲述了苏氏布商家的赘婿宁毅，帮助妻子苏檀儿一起搞事业，玩转武朝商界，成为江宁首富的故事；宁毅面对家事、国事、天下事，都勇往直前，从一个无人在意的小小赘婿，成长为真正为天下立心，为生民立命，顺应时代，也改变了时代的大人物。