No data entry directly USES an abstract class.

没有数据条目会直接使用抽象类。

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A ListEditor is an abstract class that represents a list of data.

ListEditor是一个抽象类，表示一个数据列表。

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The abstract base class has a member TreeItem that will be an instance of the TreeItem widget in GWT and will be the client data with which the callback is associated when the callback class is used.

抽象基类有一个成员TreeItem，它是GWT中TreeIte m部件的实例，包含客户机数据，在使用回调类时回调与这些数据相关联。

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