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Public class State {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."当多米尼还是个孩子的时候，他亲眼目睹了美国顶级罪犯杀害了他的在保加利亚与腐败集团作斗争的警察父亲。几年后，他试图为父亲的死亡报仇，但却被判了企图谋杀15年监禁。在狱中，他遇到了美国的照片记者，并分享他敌人的资料。While Ecklie fights for his life after his shooting, Russell's patience begins to wear thin as the team tries to get to his kidnapped granddaughter before she is killed.板栗往后一靠。Greece: 132,000