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Activity Diagram can be used to model the dynamic behavior of the system, mainly to refine the use case, that is, the details inside the use case can be described in the form of an activity diagram. The activity diagram describes the sequence of activities, the flow of control between the main table activities, the internal processing-driven process, which is ess

class is responsible for coordinating other jobs. After learning about classes and class diagrams, I began to draw class diagrams. This is really a headache. When I was writing a document, I felt very eager to draw a UML diagram, because it was useful at that time, but now I have a chance, and I really didn't know how to start it. I also read the class pictures drawn by others, but they said that you sho

PrefaceI have been using php for more than two years. I have prepared to write frequently-used design patterns based on my own practical experience. Of course, before using the design patterns, I must first understand the design patterns, therefore, we will first explain the UML class diagram. Through UML class diagrams, we can better communicate with you and exp

, after reading the above description, we should understand the relationship between the relationships and specific to the code is how, so-called repetition, is only the above extension, such as A and B has a "1-to-many" of the repetition, there is a list in a, which holds the B object's n references , that's it.Well, to here, already put the above diagram of the relationship is finished, I hope you can have some gains, I also spent a lot of time ah (

In all UML diagrams, the most easy to understand is the use case diagram, which is also a UML diagram with the least elements, and also the most handy one for product managers. I. Purpose The use case diagram is often used to describe the requirements, so that users c

From: http://blog.csdn.net/onetree2010/article/details/6197463 In Visio, the relationship between the package and the class is the inclusion relationship. After the class is dragged into the folder of the package, the relationship is established. The binary Association symbol can be set to aggregation and synthesis.Interface: hollow circle + straight line (Tang Lao duck class implements 'talking thup ');Dependency: dotted line + arrow (relationship between animals and air );Association: solid l

creators of up realized and understood the purpose of these graphs, SSD was not directly mentioned in the initial up description.Up stageInitial Stage: SSD is usually not introduced at this stage unless you want to make a rough estimation of the technology involved. This estimation is based on the identification of system operations, for example, feature or cocomo2 (see www.ifpug.org)Refinement phase: Most SSDs are created in the Refinement phase, which helps to identify the details of system e

UML class diagram Explain UMLClass diagram: 1. first, check the rectangle of "animal". It represents a class. This type of graph is divided into three layers. The first layer displays the name of the class. If it is an abstract class, it must be displayed in italic. The second layer is the class features, usually fields and

The use case diagram is used to describe the relationship between users, requirements, and system functional units. It shows a system functional model diagram that can be observed by external users. [PURPOSE]: help the development team understand the functional requirements of the system in a visual manner. The use case diagram contains the following elements:

Class diagramThe class diagram shows the construction module of the object-oriented system. Depicts a static view of a model or part of a model, showing the properties and behaviors it contains, rather than describing the function or refinement of the operation in detail. Class diagrams are most commonly used to express relationships between multiple classes and interfaces. Generalization (generalizations), aggregation (aggregations), and association

UML Use case diagram A use case diagram is the first step in the analysis of software requirements to the final implementation, which describes how to use a system. A use case diagram contains 6 elements: actors, use cases, association rela

UML class diagram relationships include association, aggregation/combination, dependency, and generalization (inheritance ). The Association is divided into two-way Association, one-way Association, and self-Association. Let's take a look at what these relationships are and what their differences are. 1. Association Bidirectional Association:C1-C2: both parties know the existence of the other side, can call

is not possible to change the implementation inherited from the parent class at run time. To make things worse, the parent class usually defines at least part of the behavior of the subclass, and any changes to the parent class can affect the behavior of the child class. If the inherited implementation is not suitable for solving the new problem, the parent class must be overridden or replaced by another more appropriate class. This dependency limits flexibility and ultimately limits reusabilit

, the general relationship can be expressed as follows: The above is an article I have referenced. I think the difference between the three relations is very clear. Based on this, I will combine my own system to explain the project (Online Shopping System) as a whole.**************************************** *************************(1) overall system use case diagram Follow the overall use case first, and then the subsystem use case to describe it

in Java. The difference between Association and aggregation is purely conceptual and strictly reflected in semantics. Aggregation also implies that there is no loop in the instance diagram. In other words, it can only be a unidirectional link. Figure F Composition) Synthesize (Figure G) Is a special form of aggregation, suggesting that "local" is responsible for the lifetime of the "whole. Synthesis is not shared. Therefore, although local data may

UML class diagram relationships include association, aggregation/combination, dependency, and generalization (inheritance ). The Association is divided into two-way Association, one-way Association, and self-Association. Let's take a look at what these relationships are and what their differences are. 1. Association Bidirectional Association:C1-C2: both parties know the existence of the other side, can call

Before learning UML class diagrams, recommend a good website with lots of open source projects: Http://www.oschina.net/project. Also recommend an open source project: STARTUML, all of the following class diagram and the diagram between the classes are drawn with STARTUML. Let's take a sample before learning UML: Comme

Reading videos or tool books, including summaries, is in the theoretical stage. "The last word on the paper is superficial. I know that this is a must ." Now we are in the UML document stage, and it won't work unless we do it. I have done the "Data Center Charging System" before. To put it bluntly, I am blind. I have no rules to follow the feeling. The training solution provides the following explanation: "We have already done this because of the data

Recently has been learning the basic knowledge of UML, after watching the video, and did not have a good summary, in the process of drawing found a lot of problems, the following is the process of reading their own summary of the UML use case diagram of a little knowledge, share with you. First, the concept A use case diagram