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.
该方法返回一个项目列表，构造器希望下一次运行时能使用这些项目的delta。
The method returns a list of projects for which the builder would like a delta the next time it runs.
Eclipse记录资源的变化并向构造器传递一个delta，即上一次构建以来变化的资源列表。
Eclipse attempts to track changes to the resources and pass the builder a delta — a list of resources that have changed since the builder last ran.
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