IT新闻集锦(5)

Message

(1) A message is an individual piece of e-mail.

(2) In computer systems in general, a message is an information unit that the system sends back to the user or system operator with information about the status of an operation, an error, or other condition.

(3) Using some telecommunication or data access methods, a message can be the unit of information or data that is transmitted from one program or user to another.

(4) In messaging, which is the formal exchange of event notification, requests, or replies between programs through a messaging server, a message is data in a specified format that describes an event, a request, or a reply between programs.

(5) In object-oriented programming, a message is the way that one program object requests an action from another object. A message specifies the name of the object to which the request is made, the action (or method) to be performed, and any parameter or value that needs to be specified for this request.

XP

One other well-known methodologies in application development is Extreme Programming, or XP, which stresses iterative development, constant testing and collaborative development. Iterative development is a key issue. Unlike the“waterfall” approach, in which a project progresses from stage to stage, iterative development lets successive increments of the project go through the cycles, allowing for constant feedback and course corrections.

消息

(1) 消息是一段独立的电子邮件。

(2) 就一般的计算机而言，消息是系统发送给用户或系统操作员的信息单元，它含有某个操作的状态、错误或其他条件的信息。

(3) 在使用某些通信或数据存取方式时，消息可以是从程序或用户发送给另一方的信息或数据单元。

(4) 在消息传送中，它是通过传信服务器在程序之间进行事件通知、请求或答复的正式交换，消息是按规定格式写成的数据，它描述程序之间的事件、请求或答复。

(5) 在面向对象编程中，消息是一个程序对象要求另一个对象完成一个动作的方法。消息规定了发出请求的对象的名字、要完成的动作(或方法)以及需要为此请求指定的任何参数或数值。

XP

极限编程(XP)是另外一个著名的应用程序开发方法论，它强调迭代开发、不断测试和协作开发。迭代开发是关键。迭代开发与“瀑布”法不同，在瀑布法中，一个(软件开发)项目按部就班地从一个阶段进入下一个阶段，而迭代开发让项目在整个周期中连续不断地进行，允许不断的反馈和过程的修正。