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String str= "Hello, World";AbstractCalculator is an auxiliary class that provides auxiliary methods. Next, implement each of the following classes in turn:香凝点头道：臣妾和乳母照顾的很好，小家伙越来越壮实了。“若能去神滨的话，魔法少女就能得到拯救”讲述的是发生在四川隆昌县一个农村进城姑娘王单凤艰难创业的故事。In addition, they apply different stages of design, and the appearance mode is used in the early stage of design, because the system needs to rely on appearance in the early stage, while the adapter is applied after the design is completed. When it is found that the designed classes cannot work together, the adapter mode can be adopted. However, in many cases, the use of adapter mode should be considered at the early stage of design, such as involving a large number of third-party application interfaces. Proxy mode is that after the mode is completed, it wants to be provided to other clients in the form of services for calling. At this time, other clients can use proxy mode to access the module.