久久人爽

The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From BaiduAban lives for news. He doesn't look for news, and the news will look for him. During the Anti-Japanese War, when the Chinese Air Force mistakenly bombed Nanjing Road, Aban was purchasing from Yongan Company with his assistant Bilinghan. He was sitting in the car, knocked unconscious by the explosion and suffered minor injuries. Bilin Han was seriously injured and almost died in the Yongan Company building. Aban used a whole chapter to describe the situation at that time, from the citizens looking up at the plane to the rescue and rehabilitation after the explosion, such as focus plane, which was meticulous and true. Its first-hand historical value was extremely precious.First of all, let's take a look at the timetable required for each station of Nagoya subway.越军即将占领南方，越国的影响力，越王尹旭举足轻重的地位已经成为一个事实。三十年代旧上海，歌舞升平，纸醉金迷，有那么一个倔强的女孩——宋永芳，白天是圣约翰大学神秘的旁　 监狱的典狱长温特上校素以严酷的铁腕政策而著称，起初，埃尔文对这位富有传奇色彩的上校颇为崇敬，但在埃尔文表达出他对典狱长管理方法的不满之后，这种崇敬就演变成了一种敌意和仇视。埃尔文与腐败的典狱长开始了公开的对峙，日趋激烈的对峙最终引发了一场声势浩大的越狱行动：埃尔文指挥着自己招募起来的“新军”——1200多名狱友，掀起了推翻典狱长统治的大战。