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) 消息是一段獨立的電子郵件。

(2) 就一般的計算機而言，消息是系統(tǒng)發(fā)送給用戶或系統(tǒng)操作員的信息單元，它含有某個操作的狀態(tài)、錯誤或其他條件的信息。

(3) 在使用某些通信或數(shù)據(jù)存取方式時，消息可以是從程序或用戶發(fā)送給另一方的信息或數(shù)據(jù)單元。

(4) 在消息傳送中，它是通過傳信服務(wù)器在程序之間進行事件通知、請求或答復(fù)的正式交換，消息是按規(guī)定格式寫成的數(shù)據(jù)，它描述程序之間的事件、請求或答復(fù)。

(5) 在面向?qū)ο缶幊讨?，消息是一個程序?qū)ο笠罅硪粋€對象完成一個動作的方法。消息規(guī)定了發(fā)出請求的對象的名字、要完成的動作(或方法)以及需要為此請求指定的任何參數(shù)或數(shù)值。

XP

極限編程(XP)是另外一個著名的應(yīng)用程序開發(fā)方法論，它強調(diào)迭代開發(fā)、不斷測試和協(xié)作開發(fā)。迭代開發(fā)是關(guān)鍵。迭代開發(fā)與“瀑布”法不同，在瀑布法中，一個(軟件開發(fā))項目按部就班地從一個階段進入下一個階段，而迭代開發(fā)讓項目在整個周期中連續(xù)不斷地進行，允許不斷的反饋和過程的修正。