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李敬武哪里肯信，整日缠磨，惹得板栗见了他就跑。This mode applies to scenarios: If we want to add new functions to an existing class, we have to consider several things: 1. Will the new functions have compatibility problems with the existing functions? 2. Will it need to be added later? 3. What if the class does not allow code modification? Facing these problems, the best solution is to use visitor mode, which is suitable for systems with relatively stable data structure, decoupling data structure and algorithm,　　谈到“写给父母亲的信”能够在韩国如此轰动，风靡程度甚至超过一些正在播映的偶像剧，金喜爱认为，这部戏剧本、卡司、演技三位一体都很强，整个团队包括编剧、演员有一家人的感觉，大家在片场有默契，所以在荧幕上的表现就更好。This principle means that there are no methods in each interface that subclasses cannot use but must implement. If not, the interface must be split. It is better to use multiple isolated interfaces than to use a single interface (an interface where multiple interface methods are assembled into one).Look at the source code react event mechanism见他好似没啥大的不对，便点头道：好。