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他就是天启老师。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."Attacks directed at specific applications are generally covert, smaller in scale and more targeted.0 There are two ways to trigger a delegate: delegate instance. Invoke (parameter list), delegate instance (parameter list)杨长帆轻描淡写，扛下了一切。公府西角门大开，参选的少年们从这里陆续进入，才一会工夫就把院子中央站得满满的。