Public void del (Observer observer);
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:
The main attack resources analyzed include:
《小戏骨：刘三姐》是在1960年电影《刘三姐》的基础之上精编而成，保留了原版《刘三姐》中的主要情节，并且着重演绎了“水边赛歌”的情节。
该剧以婚姻介绍所的形式上演不同人的爱情故事，抓住当下“剩男”、“剩女”大众关注的话题，紧扣时尚和个性，以更加独特的视角展现当代人的婚恋观。本剧围绕性格迥异的几个人物展开，形形色色的人物通过征婚在婚介所上演不同版本精彩故事。剧情诙谐幽默、人物个性鲜明、情节扣人心弦、结局出人意料。每一段征婚故事，集集搞笑，场场精彩，情节扣人心弦、剑拔弩张。34岁的安娜因感情屡次受挫，索性自己开了一个婚姻介绍所，当起了月老红娘。婚介所有四个员工：婚介代表莉莉，美貌性感，爱情理论丰富大胆；会计杨大妈，热心朴素，保守迷糊，好心常常办坏事；还有天天耍贫耍酷，表演欲望极强的网络维护员杨凡，加上开业当天来应聘的一根筋的单纯女孩郭郭。来婚介所的征婚者更是五花八门，既有不会浪漫的理科男生，眼高手低的女白领，满眼是钱的时尚女孩，也有替儿媳妇找对象的婆婆。他们年龄不同，条件不一，各有各的爱情困惑，但他们都渴望爱情，一个个啼笑皆非的故事悄然上演。
一波未平，刑警队又接到报案：市郊的鱼塘边发现一名女性的尸体。经检验死者胃中有大量烈性安眠药，衣服上留有精斑。在死者的办公室刑警队发现了遗书，遗书中声称其是被顶头上司王处长多次奸污，才愤然走上轻生之路。经DAN对比，精斑为王处长所留，看来真相大白了，可是过于简单的案情上起了刑警队长郭子健的疑虑
We are the builders of the future of the society, so we should use our hearts to walk out of the ivory tower and go into the society to understand the national conditions and serve the society. The social practice of "three rural areas" in summer is an effective way to let us know the society, serve the society and exercise ourselves. This social practice of "three rural areas" has enabled me to understand my social position, define my mission on my shoulders, and further stimulate my enthusiasm for learning. I deeply realize that teachers are role models for students, and our words and deeds are seen by students. Therefore, while teaching students, we should also strive to improve our comprehensive quality. At the same time, I also deeply realize that teachers should not only preach, teach and dispel doubts, but also guide students to establish correct learning attitude and correct outlook on life, world outlook and values. This summer's social practice has not only cultivated our potential to apply theory to practice and the spirit of teamwork, honed our strong will, but also realized the goal of "serving the society and exercising to become a useful person" in the process of social practice. I remember someone once said: whether a graduate is a talented person or not depends on his academic qualifications and social practical experience. Because theoretical knowledge alone is far from enough, without any potential for social practice, one cannot connect with the rapidly developing society. So there was this dragon neck trip.
V-shaped socks are not only beautiful, but also convenient to wear and take off.
影片改变自歌德的诗剧《浮士德》的第一部分，是关于浮士德和少女玛甘蕾的故事。天使和魔鬼打了一个赌，倘若他能俘获浮士德的灵魂上帝就奖世界让给他，魔鬼给城市带来了瘟疫，浮士德想找出解药却找不到，他只能眼睁睁看着他，魔鬼和浮士德订立契约，魔鬼以仆人身份出现，带着浮士德开始新的人生。条件是浮士德一旦感到了满足，灵魂便归魔鬼所有。魔鬼在浮士德看见了肉欲狂欢的世界，并设计让少女爱上了浮士德。而不由自主爱上浮士德的少女去求助马歇姨妈，他们相爱了。马歇姨妈却因为喝了魔鬼调制的酒变得神经兮兮。少女为了和浮士德幽会给母亲服了过量安眠药，致使老人死去。而魔鬼挑唆少女哥哥瓦伦丁和浮士德争斗，瓦伦丁死于浮士德剑下。少女成了镇子的罪人，冬天，她生下了自己的孩子，孩子得不到救助在雪中悲惨地死去。她被人当成了杀人犯被判火刑，浮士德得知后赶回小镇，冲上火刑台，和少女一同赴死。感动了上帝也战胜了魔鬼。
可以说韩信对现实的看法过于乐观，对自身的实力过于自信。
1. It is the most basic to have a comprehensive grasp of product attributes.
(2)到过去的下午(松田圣子 秋本奈绪美)
梁口市兴达贸易公司董事长谭江被秘密绑架，谭江嘱夫人不要报案。谭夫人依言取出赎金，放在家中。绑匪竟上门取走，真是胆大妄为。
The construction of intelligent factories is undoubtedly an important way for manufacturing enterprises to transform and upgrade. At the same time, the blueprint for the construction of intelligent factories should be reasonably planned around the medium and long-term development strategy of enterprises and according to the characteristics of their own products, processes, equipment and orders. On the basis of promoting standardization and standardization, starting with the most urgent problems to be solved, we will practically promote the construction of intelligent factories.
睿希发现了妍雨的天赋，帮助她走向成功的主持人之路，但后来得知东硕对妍雨的爱护，心中极不是滋味，最后更得知妍雨竟是自己同父异母的妹妹……
京都动画的摄影棚被放火，34人死亡，34人负重伤和轻伤的事件。在全世界都传来了悲伤的声音的同时，也涌起了“不要输”“加油”的声音。美国的动画关联公司建立的官方网站，已经聚集了2亿日元以上，现在金额也在持续增加。法国和泰国的动漫迷们也呼吁支援。京都动画被世界称为“日本之宝”，是世界上引以为豪的文化的载体。这次事件再次突出了损失的大小通过对相关人员的单独采访挖掘。
范文轲摇头道：那又如何？依兰不过是个女儿。
……次日午时三刻，杭州府宫港口，汪直喝下了壮行酒。
