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This article mainly introduces the relevant knowledge of UML requirements analysis and modeling design methods, the content is detailed and easy to understand, the operation is simple and fast, and has a certain reference value, I believe you will have something to gain after reading this UML requirements analysis and modeling design method article, let's take a look at it.

1 introduction to UML

UML (Unified Modeling language) is the standard of object-oriented modeling language. It can model any system with static structure and dynamic behavior. Its main function is to help users to describe and model. It can describe the whole process of software from requirement analysis to software implementation and testing. The important content of the standard modeling language UML can be defined by five types of diagrams (ten graphs), as shown in Table 1.

2 Modeling and design of UML in library management system

Taking the book management system as an example, combined with Rational Rose2003 tool software to draw graphics, the modeling process of UML is described in detail.

2.1 requirements Analysis description

The library information management system is an electronic file management system that uses computers to process a large number of books. In this system, it mainly meets the needs of borrowers, librarians and system administrators. For borrowers, it is mainly to query personal information, query book information, book books that are currently being borrowed by others, borrow books and return books, etc. The librarian is the main user of the system and is responsible for the processing of borrowing and returning books. cancel the book reservation when the reader's book is lent to a given subscriber. The system administrator is mainly responsible for the maintenance of the system, which involves reader information management, book information management, system state maintenance and so on. The functional analysis of the system is shown in figure 1, Chinese thesis Alliance-WWW.LWLM.COM.

2.2 Model building

1) the establishment of use case model

In order to establish the use case model in the UML application of the library management system, the first step is to determine the Actors. Actors represents the person or system who provides or receives system information. They are people or transactions that interact with the system and represent the users of a system or the goal of external communication. A use case is a functional unit in a system, which can be described as participating in an interaction between systems. The purpose of the use case model is to list the use cases and actors in the system and to show which is the execution of the use case. According to the above system analysis, the roles determined by this system are borrower, librarian and system administrator.

2) the establishment of static model.

The static model of UML application in the library management system describes the view of the system from a static point of view according to the system structure. It defines the objects and classes in the system and the relationship between classes and the internal structure of the class, that is, the attributes and operations of the class.

Analyze the use case model and system functional requirements, the main classes in the library management system are Item (item), Title (title), Loan (loan), Reservation (reservation), Borrower (borrower information) and so on.

3) establish dynamic model

After the static model of the system in the UML application of the library management system is established, the dynamic modeling of the system begins. The dynamic model describes how the function of the system is completed. Sequence diagrams, activity diagrams and collaboration diagrams are used to describe the interaction between objects and objects from different angles.

The sequence diagram represents the interaction as a two-dimensional diagram. Vertically is the timeline, and horizontally represents the meta-roles of independent objects in collaboration. Meta-roles are represented by lifelines. When the object exists, the character is represented by a dotted line, and when the process of the object is active, the lifeline is a double line. The arrow representation of a message from the lifeline of one object to the lifeline of another. The arrows are arranged from top to bottom in the diagram in chronological order.

4) establish the implementation model

UML in the UML application of the library management system uses component diagrams and deployment diagrams to describe the implementation of the system. These two diagrams describe some characteristics of the implementation of the system, mainly related to the static distribution of the source code and the implementation characteristics of the whole system.

The component diagram shows the distribution of software components in the system and the dependence between them, that is, the logical structure.

After the modeling is completed, the UML modeling tool Rational Rose2003 can generate the code framework of the system according to the component diagram of the system, and the code to be generated depends on the selected programming language. The system chooses VB language, which usually includes class declaration, attribute declaration, scope declaration and so on. After the code is generated, the whole code can be written according to the specific business, and the system can be realized finally.

This is the end of this article on "methods of UML requirements Analysis and Modeling Design". Thank you for reading! I believe that everyone has a certain understanding of "UML requirements analysis and modeling design methods" knowledge, if you want to learn more knowledge, welcome to follow the industry information channel.

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