从属类型是运行时值参数化的类型(与泛型比较，泛型是其它类型参数化的类型)。
Dependent types are types parameterized by run-time values (compare this with generic types, which are parameterized by other types).
从属类型的标准实例是数组大小参数化的数组。
The canonical example of dependent types is that of an array type parameterized by the size of the array.
从属性文件读取的和在实例化 ClientIdCallbackHandler时设置的用户名和密码。
Username and password read from a properties file and set when the ClientIdCallbackHandler is instantiated.
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