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Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.For example, int [] sorting has bubbling, selective sorting, merging, heap and other algorithms. Each algorithm is a Strategy, which is encapsulated according to and can be used independently.讲述了主角一觉醒来，世界大变。熟悉的高中传授的是魔法，告诉大家要成为一名出色的魔法师。崇尚科学的世界变成了崇尚魔法，偏偏有着一样以学渣看待自己的老师，一样目光异样的同学，一样社会底层挣扎的爸爸，一样纯美却不能走路的非血缘妹妹……Gossip Girl是曼哈顿上东区最神秘的人物，她是我们了解上流贵族巨细无遗的生活的唯一来源，且拥有一众随时随地为她提供八卦消息的公子哥千金女。而今年最重要的新闻，莫过于Serena Van Der Woodsen（Blake Lively 饰）在车站下车。这意味着这位曾经的学校女王、一年前谜一样消逝的风头人物，重回大家的生活，激起千层浪。第一个浪花来自Blair（Leighton Meester 饰），她和S曾经是最好的朋友，然而一年前好友的不辞而别彻底伤了她的心，如今回归给她的女王地位带来威胁。敌对，在一开始就成为她们友谊的立场。Blair的男朋友Nate（Chace Crawford 饰）对S怀着非同一般的感情，这让B更加敏感。Nate的好友Chuck素以花花公子著称，是不折不扣的二世祖。与这些富家子弟形成鲜明对比的，是出身布鲁克林的Dan（Penn Badgley 饰）和Jenny，Dan坚信用学识和努力可以战胜出身得到自己应得的一切，而小Jenny则不可避免地，像她那个年龄段的女孩子一样，受到虚荣的招手诱惑，渴望成为Blair那样的焦点女王。S当年出走的原因是什么，B和N的感情是否能瓜熟蒂落，D又会跟这些上流社会的人们发生什么纠缠，J是否如她所愿踏进上流殿堂，还有他们的家庭和父母，这一切，都由gossip girl为你细细道来，绝无遗漏。Li Shanglong, a young writer, told a story: When he first went to college, a classmate in the dormitory was very stingy. On one occasion, Li Shanglong's cell phone ran out of electricity, so he asked this classmate to borrow his phone and call home. After the call, Li Shanglong returned the phone to him and turned out of the dormitory.Hello, I am very happy to answer for you!