动态代理类给了我们一种以统一方式方便地处理任何方法上的验证途径，同时把所有的验证逻辑完全与核心业务逻辑分离开。
Dynamic proxy classes give us a way to easily handle validation on any method in a uniform way, while completely separating all of the validation logic from the core business logic.
Charles：我认为JVM是目前最好最快的途径，不论对于静态语言还是动态语言。
Charles: I think the JVM is by far the best way to get a new language up and going quickly, whether it's static or dynamically-typed.
JDBC提供了两种途径来执行动态sql，因而也提供了两种不同的接口。
JDBC offers two possibilities to execute a dynamic SQL statement and, therefore, provides two different interfaces.
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