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So far, a simple file upload program has been written. Of course, this is still a counterexample. The disadvantage here is the same as the first code in the light example. The program is full of if and else conditional branches. The state and behavior are coupled in a huge method. It is difficult to modify and extend this state machine. This problem is exacerbated by the complexity of the links between file states清朝末年，平安镇。鞭炮声中，一顶花轿抬进了茶叶庄的杜家，杜老爷要续弦了，婚礼进行的时候杜老爷十五岁的女儿兰嫣没有出现，杜老爷为了找女儿，丢下了站在堂中的新娘方玉奴和满堂宾客，转身离开，令玉奴倍感委屈。兰嫣的后妈玉奴人前人后二个模样，人前对兰嫣如亲生，人后不断地虐待兰嫣，她告诉兰嫣——假如你说出去的话，你爹就会发怒，这个家就散了，你愿意吗？于是兰嫣一次又一次地忍让着，委屈着，幸有冷云一直照顾，才让她觉得人情还有一丝温暖。五年后，兰嫣在药材铺老板周世安家做丫鬟，因为生得美艳，屡被周世安调戏。偶遇瘸脚的陆大有，陆大有拿出存了十年的钱给媒婆九娘，要她帮自己给兰嫣赎身。The address of each function in the target program libc can be obtained by leaking memory, which can bypass the address randomization protection.头戴金翟翠珠冠，身穿朱红云霞翟纹袍服，披蹙金绣云霞翟纹霞帔。正当官员们讨论著如何令方唐镜碰上玉罗刹，玉罗刹却碰上了另一个对手，一个她命中的冤家：南屏混吉王?陈梦吉。刘黑皮急忙查问。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: