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萧何道：万分抱歉韩信。A) Use simpler object-oriented languages such as Java, C #. GoF's [design pattern] is essentially an object-oriented design pattern. [GoF · 1.1] mentioned that "the choice of programming language is very important, which will affect the starting point of people's understanding of the problem". From the perspective of learning design patterns, Java and C # are easier than C + +. Such as Java interfaces, can more effectively show the intention of design patterns.3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.《皇甫少华与孟丽君》本剧情始于云南孟尚书家有其女孟丽君聪明绝顶，国色天香。刘家媒人和皇甫家媒人同时至孟府向孟父提亲。因两家官位高阶双方不能有得罪，于是孟父提出射箭断袍，皇甫少华赢了。于是孟父把丽君许配给少华。与此同时，丽君和自小一起长大，情同姐妹的苏映雪约定要同配一夫。Prepare contingency plans in advance