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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.板栗哦了一声，道：你是说，平常的时候，山下村里人会上山来买豆腐？和尚急忙把头点得跟小鸡啄米似的头。一个小镇社区齐心协力，采取一切必要手段，从中根除海L因流行。Bridge.setSource (source2);6. Press Ctrl+3? Key, open the "Tools Palette" and drag the created dynamic "Block" graphic to the "My Tools" palette with the mouse. (If you don't have this palette, right-click the status bar of the tool palette, click "New Palette" in the shortcut menu, and name the new palette "My Tools.")故事讲到陈山聪跟李施嬅是一段前世今生的孽缘爱情，由六十年代拖到现代，而在六十年代时，金宵大厦已经存在，所以他们的孽缘爱情在今世再续前缘。其间金宵大厦怪事不断，不停上演着其他住客的人生及奇幻故事！很快，他的不安就变成了现实。