The FacesContext object contains all the state information JSF needs to manage the GUI component's state for the current request in the current session.

FacesContext对象包含了JSF用来管理当前会话中当前请求的GUI组件状态所需要的所有状态信息。

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The wait() method tells the current thread to go into an inactive state and wait for another thread to call notifyAll() on that object.

wait()方法将通知当前线程进入非活动状态，并等待另一个线对该对象调用 notifyAll()。

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Whenever a controller needs the current state of the user interface, it can use the view_state method to reference the view's copy of the model and the current transfer object.

每当控制器需要用户界面的当前状态时，它可以使用view_state方法来引用视图的模型副本和当前的传输对象。

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