A member function with public visibility can be invoked by any other member function in any other object or class.
在任何其它对象或类中的任何其它成员函数都可以调用具有公有可视性的成员函数。
This class member will contain the application object that stores employee data or organizational data depending on what the TreeItem widget represents.
根据TreeIte m部件代表的内容不同，这个类成员将包含存储职员数据或组织数据的应用程序对象。
You can test this using the instanceof operator, which returns true if the object is a member of the indicated class, as shown in Listing 14.
可以使用instance of操作符来测试这一点，如果对象是指定类的成员，则返回true，如清单14所示。
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