市场营销的重点在于销售产品或服务，通过广告来吸引客户，同时与客户建立关系。

Marketing focuses on selling your product or service, attracting customers through advertising, and also building relationships with customers.

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清单6显示了如何为User接口建立动态代理(用userimpl实现类)，同时通过调用处理程序传递所有的方法调用。

Listing 6 shows how to create a dynamic proxy class for the User interface (using the UserImpl implementation class), while passing all method invocations through the invocation handler.

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通过它可以建立更大的模板系统，同时又降低了每个模板的复杂性。

With it, you can have much larger template systems while you reduce the complexity of each template.

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