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看着陈启的眼睛，说道：我知道了。(2) Ships whose manoeuvring ability is limited;#末日巡逻队##Doom Patrol#正式获得第二季续订，新的一季将于2020年播出。那是当然了，当初我的理想是去见见二爷，不过等出了‘跪蚂蚁这件事后，我就不想去见二爷了，我想去见见王大姐。After talking for a while, we have been talking about the rules in the above description, but we have not elaborated on them. Now let's talk about it.The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.In the event that the button button is pressed, Context no longer directly performs any substantive operations, but delegates the request to the currently held status object for execution through self.currState.buttonWasPressed (), with the following code: