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2. There will only be one instance per startup in the application. Such as account system and database system.When your requirements are only A and the requirements will not change in the future, there is no need to use factory mode. To put it bluntly, packaging is changing. When your requirements change and change greatly and frequently, using mode is a good choice. Packaging "change" is the principle of design mode.The above design, as commented above, when executing the Resize method of SmartTest, if a rectangular object is passed in, when the height is greater than the width, the width will be automatically increased until it exceeds the height. However, if a square object is passed in, it will fall into a dead loop. The fundamental reason at this time is that rectangles cannot be the parent class of squares. Since there is a problem, they can be reconstructed so that both of them inherit from quadrilateral classes. The refactoring code looks like this:【感情线索】　　Indeed, promoting the classification of domestic waste and enhancing the enthusiasm of the public are conducive to solving the problem of insufficient recycling and utilization of express packaging. In addition, some domestic enterprises are also making efforts. Enterprises will set up waste express packaging recycling desks at express service points in colleges and universities to encourage the recycling of express packaging.The specific UML structure diagram is as follows:《爱之初》是由赵晨阳执导，俞飞鸿、姜武、李乃文、颜丙燕、王一楠、陈亦飞领衔主演的都市情感剧。