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You can see that when you jump to SecondActivity twice, the instances are different, and you finally return to the desktop as many times as you enter. Here, I entered the SecondActivity twice, and finally exited the application from the SecondActivity for 4 times, as shown in the following figure板栗忽然嬉笑道：葫芦哥是不是担心我娶不上媳妇？不会。One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.そこに扉があった 沢口靖子 関山耕司The two main attacks of model theft are:杨长帆赞叹一声，而后抬手，潇洒地扯下了脑袋上的头巾