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:
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The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:
Liz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science or ultimately be consigned to history.Should zoos cull their animals to manage populations? Liz travels to Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer.But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them from stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.
记忆浮岛
齐宣（明道 饰）是当红模特，英俊帅气，有着一大批忠实的女粉丝。曾经，一场意外让齐宣和钟无艳相识，彼此定下了婚约，如今，齐宣已然成为了一个标准的“颜控”，面对“丑陋”的钟无艳，他避之而不及，与此同时，一位名叫夏迎春（王思平 饰）的美艳模特出现在了齐宣的身边，把他迷得五迷三道的，这让深爱齐宣的钟无艳深感心痛。齐宣不需要钟无艳的感情，却需要她的智慧，他需要钟无艳帮助他坐稳集团总经理的位置。
It is understood that the second season of the program will debut on July 15, 2018 and will be broadcast on CCTV Financial Channel from 19: 00 to 20: 30 every Sunday, with a total of 25 issues. The 26th Charm Ceremony will be broadcast on January 1, 2019.
It should be noted that the main application scenario of CommonJS specification is server-side programming, so the strategy of loading modules synchronously is adopted. If we rely on three modules, the code will load them one by one.
方刚（陆斌 饰）、萧佛（蒋健 饰）和沈金明（王劫 饰）是少管所里新来的三位少年犯，方刚持刀伤人，本性不改，萧佛小偷小摸，惹是生非，只有沈金明是一心一意在此改过自新的。一场意外中，方刚谎称自己吞了剪刀，企图找机会逃跑，然而，当他看到冯队长是如何为了救他而费劲了心机后，方刚被感化了。 女记者谢洁心（朱曼芳 饰）察觉到了表面上吊儿郎当的萧佛内心里其实是个非常讲义气的好孩子，她采访了萧佛，挖掘了深藏在他背后的痛苦往事。谢洁心将这些写进了自己的新闻稿中，希望能够向社会发出提醒，她还找来了萧佛的父亲，希望他们父子能够破镜重圆。
You can enter "M" to enter, or you can directly click the move command button with the mouse to activate the move command, select the object, space or enter to move, determine the selected object, select the base point and select the target position.
满目疮痍的玄河水宫早已被隐藏在黑暗中的乾达婆怪物霸占，陆运等人还未从触目惊心的怪物群中脱险，又受到已经魔化的玄河河神的攻击，为救同伴卿寒，陆云以浮生图为武器，生生逼出体内操控生死天书的力量收服河神，并且又得到了一门新的技能，至此已经是陆云收服第四位轮回使者，每位轮回使者都分别代表了符道、武道、阵法、炼器的等不同方面的最强。陆云步步逼近天书的真相，即便是与天地为敌，四海为伍，此时坐在九重天之上的咒王看着陆云露出微笑：“哼，不自量力的蝼蚁...”
"Genius" is the product of training//007
Yu Dachuan, co-founder of Pea Thinking: "At present, the field of thinking ability training is still facing the challenge of cultivating parents' cognition and attracting more outstanding talents to enter the industry. This requires industry practitioners to focus on polishing products, do a good job in operation services and win a good reputation."
我不做张家的儿子，投军后一样能出头。
是啊，有好几次，外敌随时都要打到京城来的，若真是那样，有多少闺阁女子会被玷辱清白？眼看他们就要吵起来，国子监一帮学生慌忙劝住。
"Well, This is basically the case, After they all flew, they stayed in the air for a while. Then he rushed towards the position in a dark way. The closer you fly, the louder the sound will be. Finally, when the flight was just around the corner, The sound made my ears ache a little, But as we got closer, Can see some details clearly, These things are the kind of big wasps I mentioned earlier. However, they are at least dozens of times larger than ordinary wasps, one by one like birds. Their wings are flapping very fast, and because of the large number, when they fly less than 30 meters away from us, I can even feel a breeze blown by the collective flapping of their wings.
该剧初步定于2015年夏 天播出。James Wolk扮演主人公Jackson Oz，一个年轻、叛逆的美国动物学家。当他在非洲的荒野之中旅行时，发现动物们表现出奇怪的攻击行为。很快，动物们的攻击行为变得更可怕、更狡猾、更有组 织，他怀疑这件事背后隐藏着一个巨大的阴谋。他必须尽快解开这种奇怪症状大流行的真正原因——否则人类很快将无处躲藏。Nora Arnezeder扮演法国调查员、前外交官Chloe Tousignant，久经世故，性格坚强，在非洲旅行时邂逅Oz。她对动物的反常行为颇感忧虑，于是向Oz寻求庇护。Nonso Anozie扮演博茨瓦纳旅行向导Abraham，对于野生动植物有着深刻的理解，对于人类自身的问题见解更深。Kristen Connolly扮演充满激情的年轻记者Jamie，决心查出动物行为异常的真正原因。她一直在跟踪调查，似乎很快就会有所发现。来自《革命》 （Revolution）的Billy Burke扮演正直坦白的大型动物兽医Mitch。他喜欢和动物打交道，喜欢和动物在一起的简单交流方式，讨厌人类之间尔虞我诈的复杂关系。
艾薇（朱迪·科默 Jodie Comer 饰）有着一段悲惨的过去，她曾经被人囚禁在地窖之中，长达十三年之久。十三年后，艾薇终于逃出魔窟，报警求援，艾利尔特（理查德·兰金 Richard Rankin 饰）和搭档丽莎（瓦伦·凯恩 Valene Kane 饰）受理了此案，他们想从艾薇的口中获取更多的线索，然而，艾薇的证言仍旧缺少着最有力的支持，那就是确凿的证据。
CBS电视台宣布，他们将启动《星际迷航》（Star Trek）电视剧项目，这套全新剧集拟定2017年1月开播。全新的《星际旅行／星际迷航》电视剧将介绍新的角色、新的外星种族登场，同时延续该系列对种族、政治、环境等社会问题关切的优良传统，电影版编剧亚历克斯·库兹曼（Alex Kurtzman）会担任此剧的监制。四集短剧每月一集
