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Since Pizza is still an abstract class, when we create a subclass of FactoryPizzaStore, we should also implement a specific subclass inherited from Pizza. If we only create a subclass of FactoryPizzaStore without a corresponding subclass of Pizza, what does our pizza shop sell?自己有责任有义务。说实话，现在的武侠小说已经到了一个瓶颈，嗜血、仇杀、好勇斗狠，除了这些，很难看到其他的。The module mode uses an anonymous function that returns an object. Inside this anonymous function, private variables and functions are first defined for use by internal functions, and then an object literal quantity is returned as the value of the function. The returned object literal quantity only contains properties and methods that can be exposed. In this way, external use of the method can be provided; Since the public method in the return object is defined inside the anonymous function, it can access private variables and functions inside.After adding Intent.FLAG_ACTIVITY_NEW_TASK, a new task stack needs to be created to open the App. Although the problem of not being able to return is solved, it also causes new problems:Ji Minjia