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(3) Advanced SkillsLiskov 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:小茹和男友程鹏吵架分了手，她独自去了旅游散心，途中邂逅了帅气小伙张铭，两天的浪漫旅程，小茹和张铭的感情迅速升温，在分手前的夜晚，两人上床了。然而，程鹏要求和好并说要娶她。像程鹏这样的有钱公子哥儿不是每个女孩都有机会嫁入豪门的！小茹决定了，他们开始了婚礼的筹备，偶尔小茹也会想起张铭、想起那个疯狂的夜晚，她知道那样的经历或许这辈子不会再有了，那个夜晚将成为她今生永久的秘密…… 　　小茹万万没有想到，张铭又出现了，而且是作为程鹏的同事，一旦俩人关系曝光，婚礼必然泡汤，她绝不能接受这样的结局！可张铭总是流露出想和小茹重叙旧缘的意思，对于张铭的亲热举动，她还是没有拒绝……躺在床上回味着刚才的激情一刻，看着张铭那略带玩世不恭的笑容，小茹紧张绝望。她知道这样做是在玩火，但她别无选择，只能将这个危险游戏进行下去……(Update 11.22)[News] On August 26, The World Wide Web reported that "Zimbabwe's President ordered the arrest of the delegation for failing to win a medal in the Olympics", According to reports from Taiwan's "Central News Agency" and Nigeria's media PM News website on August 25, President Mugabe was outraged by the Zimbabwean Olympic delegation's failure to win medals at the Rio Olympics. He ordered the country's police chief to arrest and detain the Zimbabwean Olympic delegation. The delegation was arrested as soon as it arrived at Harare International Airport on the 23rd. Netease, Phoenix, Dongfang, Yangguang and other websites reprinted one after another.重修三次大学，玩了三年，公务员考试准备了三年的河阴奉式家族三代独子奉必（金在中 饰）是小区出名的神级无业游民。在听闻自己单恋了28年的女性朋友姜秀珍（金宥真 饰）就要结婚的晴天霹雳后，沮丧的他坠入奇怪的检查井开始了一场荒唐的时间之旅。如果无法阻止一周以后心爱的她的婚礼，那么他将以宾客而非新郎的身份出席这场婚礼。面对这样的境况，他可以成功的阻止这场婚礼，得到她的心吗？1. This kind of ball is relatively light and does not need too much force when used. It is easy for scholars to use.