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Therefore, learning design patterns, The first thing to do is to understand which aspects of design patterns are available to developers, Then, the principle, timing and method of each design pattern are studied respectively, that is to say, under what circumstances should a certain design pattern be used? When understanding the timing of a certain design pattern, it is also necessary to understand what consequences will be caused if this design pattern is not used at this time. After understanding the principle and usage of each pattern, more importantly, learning the object-oriented thinking mode, after mastering the object-oriented thinking mode, looking back at the design pattern, you will have a deeper understanding. Finally, learning the design pattern, you must study hard and practice more. "I agree with the last sentence very much."Password length cannot be less than 6 bits.嗯？老杨噎了口饭，你要让长帆考功名？不是才不到十八么。This is, he will write some sentences according to each clue and compare the results he has written with the original article.我哩，就在河边一棵桃树底下看书，然后她就来了。(1) The author of this novel: Xiaoyao de's latest masterpiece: Death Homework, uploaded by female literature netizens!尹旭没想到这个只有一面之缘的小姑娘对自己竟然如此依恋，如此用情至深。