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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."Noun Explanation:从今日起将军就是我赵国的丞相了，同时寡人加封将军为成安君。I nodded and motioned for him to talk about the battle. Zhang Xiaobo coughed lightly, cleared his throat and began to say:板栗气道：不然你还想咋样？要不等明年大哥捉只老虎送你？山芋不解其意。这些盗匪多少和番邑都有关系，让他们守会不会有什么纰漏？这两年吴芮可是可少收留强盗刑徒啊。请听 -- 吴青峰