Contrast the use of an abstract base class against an interface?
对比抽象基类和接口的使用。
This is a base class that makes writing handler classes easier.
这个基类将使编写处理程序类更加容易。
Connections are established by creating instances of the PDO base class.
连接是通过创建pdo基类的实例而建立的。
Access to data fields inherited from a virtual base class is not supported.
不支持访问从虚拟基类继承的数据字段。
The derived classes have the same dynamic class attributes of the base class.
派生类具有跟基类相同的动态类属性。
In Listing 11, the abstract base class implements an interface AsyncCallback.
在清单11中，抽象类实现AsyncCallback接口。
Mapping additional classes is done the same way as mapping the base class.
按照相同的方式对其他类进行映射。
I'll start by creating a base class that holds an instance of an Entity object.
我将首先创建一个基类，用于容纳entity对象的一个实例。
The base class also defines some simple constants for the names of the tags.
基类还为标记的名称定义了一些简单的常量。
The base class takes format, a string that specifies the data format to use.
基类获取format，这是一个指定了要使用的数据格式的字符串。
The base class is called viewer, which is an extension of a structured viewer.
基类叫做Viewer，它是结构化查看器的一个扩展。
Therefore it is a good idea to create a generic base class that can be reused later.
因而，最好是创建一个可重用的通用基类。
The parts that are common throughout all your systems go to a base class you always use.
在整个系统中都会使用的部分可以放到基类里面。
To begin we create an abstract base class which represents the service we want to expose.
首先，我要创建一个抽象基类，用于表示我们要公开的服务。
The WebComponent ACTS as a base class for simple HTML components such as Label and Image.
WebComponent充当诸如标签和图像这类简单的HTML组件的基类。
Now, to select the base class, click the Add button, and select LibraryEntry from the dialog box.
现在，可以选择这个基类，点击add按钮，然后从对话框中选择LibraryEntry。
First, create an abstract base class that encapsulates this common functionality, as in Listing 7.
首先，创建一个抽象的基类，封装此通用功能，如清单7所示。
Figure 1 presents a base class for persistent entities that contains the necessary auditing fields.
图1为包含审计字段的持久化实体提供了一个基类。
To keep the framework simple, all additional SOA error handlers will sub-class from this base class.
要使得框架简单，所有附加的SOA错误处理都将作为继承此基类的子类。
The DataMapRepository class presented previously and its base class LinkedHashMap are not thread-safe.
之前介绍过的datamaprepository类及其基类LinkedHashMap都不是线程安全的。
The ProcessConnector class in turn extends connector, which is the base class of the connector framework.
ProcessConnector类反过来扩展Connector，这是连接器框架的基础类。
Observe that the implementation emits trace events using the m_logger member variable from the base class.
观察该实现使用基础类中m_logger成员变量发出的跟踪事件。
Next, look at the ValidValuesTable class, the base class for all specific list values classes (Listing 6).
接下来，看一下validvaluestable类，这是所有特定列表值类的基类(见清单6)。
The next thing you have to do is override any method from the base class or classes to populate the column.
接下来需要覆盖来自基类或者类的任何方法来填充列。
While technically not meant to act as a generic base class for addresses, it could be used for that purpose.
虽然从技术的角度看，其没有打算充当地址的通用基类，但还是可以这样来使用。
In fact, you can substitute the base class for every node object, giving your whole application custom behaviors.
事实上，您可以置换每种节点对象的基类，从而能够定制整个应用程序的行为。
In this case, we have it just print a message to the console and then call the base class version for actual handling.
在此例中，我们仅让它向控制台打印一条消息，然后调用它的基类版本来执行实际的处理。
The idea of inheriting from a base class without being able to downcast to it or upcast to the base just seemed silly.
继承一个基类而无法将它向下或向上转换到基类的理念是不明智的。
Marking the base class as "private" allowed the derived class to inherit from it without actually becoming one of them.
将基类标记为 “私有”允许派生类从该基类继承而来，而无需实际成为 一个基类。
You might think, reasonably enough, that the same enhancement can be accomplished simply by subclassing the XO base class.
您可能会非常合理地想到，也可以定义xo基类的子类来实现同样的增强。
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