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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:魏铁不好意思地笑了。Public boolean hasNext ();　　转眼过了数年，星际探险员赛小息、天才机械师卡璐璐和宇宙战士阿铁打奉命维修飞船，却被遥远星系突如其来的神秘爆炸震散，流落四方生死未卜……赛尔先锋精英小队星际探险的航程难道就要在此终止了吗……下午，板栗等人继续选定礼。听了这话，几乎都疯了。