from concrete class的意思|示意

Another helpful addition to PHP V5 is the abstract class, which makes it easy to have one base class to implement the core of an interface from which you then create concrete classes.

PHP V 5中另一个有帮助的新功能是抽象类，使用抽象类可以轻松地用一个基类实现接口的核心部分，然后用该接口创建实体类。

To put this into a more concrete context, let's assume I've written the Student class from Listing 5 like so

为了将此放到更具体的上下文中，假设我通过以下方式编写了 清单 5 中的 Student 类

Illustrate general notions with concrete examples drawn from class discussions, your readings, your own experience of television.

用具体的事例来阐述笼统的观念，这些事例可以来自课堂讨论、你的阅读和你自己对电视的亲身体验。

The concrete DAO class contains logic for accessing data from a specific data source.

具体的dao类包含访问特定数据源的数据的逻辑。

If you only have a concrete class, you can create an interface from the class, change your application code to program to the interface, and then proceed as described above.

如果您只有一个具体的类，那么您可以从类中创建一个接口，您的应用程序代码改写为接口，然后按照前面的描述继续进行。

The dotted enclosure for the class distinguishes it from a concrete object.

图中类被用点线圈定，以区别它和对象。