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Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:而在这时，一个更大的变故产生。苹果怀孕了，而到底谁才是这个孩子的父亲成了林东与安坤赌博的筹码，四人签订协议，如果是林东的骨肉，他将给二人十二万元的补偿费，而如果是安坤的，则双方互不相欠......故事发生在麒麟艺术高中内，无数光彩夺目的明星们从这里起步，展开双翼追寻他们的梦想。然而，残酷的现实和巨大的经济压力使得学校的经营几乎瘫痪，老师们纷纷跳槽，前往其他的艺术学校，只有大大咧咧的杨真万（朴振英 饰）留了下来，和校长朱正万（全海孝 饰）一起为了维系学校的荣誉而努力奋斗着。申海星（姜索拉 饰）虽然歌艺平平，却对自己的音乐梦想十分执着。JB（林宰范 饰）的肩上所背负着的，不仅有自己的未来，还有父亲的期望。想要成为戛纳女王的莲（朴智妍 饰），整日里神神叨叨将音乐作为通灵媒介的朴顺童（刘小英 饰），这些善良开朗的年轻人们站在了擂台之上，一场激烈的音乐比赛正式拉开序幕。我们那时候也不能确定现在的玉米就是我弟弟。20,000 Yuan "Out of Control" Reporter Ma Xiaotian Peng Jieyun Editor Peng JieyunState mode-Allows an object to automatically change its behavior when its internal state changes, and the object looks like it has changed its class. The specific structure diagram is as follows: