来自Struct文档一段说明，说明了反射和内省的关系，翻译了一下：

Reflection is the process of determining which member fields and methods are available on an object.

反射是一个确定有哪些成员变量、成员方法可在一个对象上使用的过程。

 Introspection is a specialized form of reflection used by the JavaBean API. Using Introspection, we can determine which methods of a Object are intended to be accessed by other objects. The getters and the setters, for example.

内省是一种特殊的反射，被用于JavaBean API。通过使用内省，我们可以确定一个对象中哪些方法适用于被其他对象访问。例如：getter和setter方法。