JVM验证类装入器中所有的类并确保应用程序不会执行任何危险操作。

The JVM verifies all classes in class loaders and ensures that applications do not perform any dangerous operations.

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在这个类中，定义服务器操作完成时客户机页面如何处理数据(或异常)。

In this class, you define what the client page does with the data (or the exception) when the server is done.

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注意：当索引表达式被用于关系表达式，或作为某个操作符类函数的参数时，查询优化器将考虑使用函数索引。

Note: the query optimizer considers using a functional index when the index expression is used in a relational expression or as an argument to one of the operator class functions.

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