You will never instantiate this class directly, but always create an instance of its subclass.
永远不要直接实例化这个类，而是创建它的子类的一个实例。
Create a mock object class as a subclass of the concrete class.
创建一个模拟对象类作为具体类中的一个子类。
There is a subclass of the base message class specific to each type of message.
Message基类的一个子类特定于消息的具体类型。
The root element of an MXML document is a subclass of the Application class.
一个MXML文档的根元素是application类的一个子类。
As you can see, the FlickrView class is a subclass of ImageView.
可以看到，flickrview类是ImageView的子类。
The tree class represents a tree and is a subclass of Basetree.
树以tree类表示，这个类是Basetree的子类。
The first thing to do is create a subclass of the CaseFolder class definition.
首先，创建CaseFolder类的一个子类。
The proxy class is an actual subclass of the persistent class.
实际上，代理类是持久化类的子类。
Select the correct class or subclass for the employee's business unit.
选择员工业务单位的正确类别或子类。
Extend an existing View class or subclass with your own class.
从现有控件类或其子类扩展你自己的类。
Extend an existing View class or subclass with your own class.
从现有控件类或其子类扩展你自己的类。
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