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In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article://Since the single pattern is instantiated only once, the following instances are equalAfter I hit 4.5 firearms division, I also killed the little monster around the shadow. The shadow also came to the kite side, but there was only one dialogue, that is, I asked to take another lock. What's going on?13. Os.chdir ()--Change directory to specified directory你有意思么？二夫人稍候。第一，他走。