构造函数的初始化列表为类的一个或多个数据成员指定初值。
A constructor initializer list specifies initial values for one or more data members of the class.
此类在其构造函数中初始化 DWR 提供的 org.directwebremoting.WebContext 类的实例，然后向 StockQuoteGenerator's 侦听器列表注册自身。
This class in its constructor initializes an instance of the org.directwebremoting.WebContext class provided by DWR, and then registers itself with StockQuoteGenerator's list of listeners.
没有在初始化列表中初始化的类成员，使用它们的默认构造函数隐式初始化。
Class members that are not initialized in the initializer list are implicitly initialized by using their default constructor.
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