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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."上个世纪二三十年代，第二次世界大战在全球点燃战火，烽烟四起，日本侵略军在中国大地肆虐横行，而不能生产一粒粮食、以打渔为主要生存方式的澳门，在日军的水陆两路封锁下，度日如年，经受着前所未有的考验……俞大猷将喝空的坛子砸在地上，握拳怒道，对着自己人窝囊也便罢了。Strength amulet 6尹旭不禁心中感叹，人情凉薄啊。　　然而，天有不测风云，一场又一场的麻烦和变故，接二连三地降落在他们身上……而这一切还只是开始，一个巨大的灾难正慢慢朝这个村子袭来……