Why do the subclasses not appear in the schema?
为何模式中没有子类？
Now let's examine the specific Buffer subclasses.
现在让我们研究一些具体的buffer子类。
All SimpleNode subclasses inherit useful behavior.
所有simplenode子类都继承了有用的行为。
This allows subclasses to only override methods as needed.
这允许子类根据需要仅覆盖一些方法。
Concrete subclasses define the different required behaviors.
具体的子类定义需要的不同行为。
Classes now have constructor, superclass, and subclasses properties.
类现在有了constructor、superclass和subclasses属性。
In programming languages, this capability is provided by subclasses.
在编程语言中，通过子类提供这一能力。
However, the API docs don't show any concrete subclasses of IndexReader.
不管怎样，API文档没有提到任何IndexReader的具体子类。
The master table has all of the columns of the parent and all subclasses.
主表具有父类和子类的所有列。
They can also be thought of as functions mapping classes to new subclasses.
它们也可以被认为是将类映射到新子类的函数。
Also the second query doesn't need to include properties in other subclasses.
第二个查询中不需要包含其他子类中的属性。
Even if you don't change your Exception subclasses, you can still chain them.
即使不改变您的exception子类，您仍然可以将它们链接起来。
The self keyword points to the containing class and is unaware of subclasses.
self关键字指向的是包含类，且不会意识到子类。
Mixins can be viewed as functions mapping existing classes to new subclasses.
mixin可被视为将现有类映射成新子类的函数。
Again the second query doesn't need to include properties in other subclasses.
同样的，第二个查询不需要包含其他子类的属性。
We actually don't have to declare a class that subclasses Button with Subject.
我们实际上不用声明一个继承subject的Button的子类。
Joda classes that represent immutable instants in time are subclasses of this one.
表示时间上的不可变瞬间的joda类都属于这个类的子类。
However, there is no portable means to send specific subclasses of RemoteException.
然而，却没有用于发送RemoteException的特殊子类的可移植方法。
Assure that the factory method is accessible to the target object and its subclasses.
确保目标对象及其子类可以访问工厂方法。
In fact, my example subclasses Monitor to provide some (slight) enhanced capabilities.
事实上，我的示例使Monitor子类化，以提供某些(稍微)增强的能力。
This class has a number of subclasses that can construct images from different sources.
这个类有许多可以从不同来源构造图像的子类。
There are too many permutations to easily create subclasses for every enhancement scenario.
有太多的替代方法可以轻易地为每种增强情形创建子类。
So, in your situation: your application exception classes are subclasses of RuntimeException.
因此，对于您的情况：您的应用程序异常类是RuntimeException的子类。
More specifically, it is the ability of subclasses to respond differently to the same messages.
更具体地说，它是子类对相同消息做出不同反应的能力。
If so, the client and service could exchange subclasses of Order containing subclasses of Item.
如果是这样，客户端和服务就可以交换包含ite m子类订单的子类。
Subclasses are often used to evaluate the completeness of the flow of events and the business rules.
子类常常被用于评价事件流的完整性和业务规则。
Instead, I add extra methods to the subclasses that perform the appropriate action for each subclass.
相反，我向为每个子类执行适当的操作的子类添加额外的方法。
One is that when you modify a class you have to modify its table and the table of any of its subclasses.
一个是当修改类时，必须修改它的表和它所有子类的表。
Qualified subclass name: name subclasses to communicate the similarities and differences with a superclass.
子类名称要合格：对子类的命名会表述出其与超类之间的相似和差异之处。
You certainly can provide optimized implementations of these methods in your subclasses, but you don't have to.
当然可以在子类中提供这些方法的优化实现，但是不是必须这么做。
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