uml diagram software free

In UML class diagrams, the following relationships are common: generalization (generalization), implementation (realization), Association (association), Aggregation (Aggregation), composition (composition), dependency ( Dependency). Can be used in the PowerDesigner software, relatively simple. 1. Generalization (generalization) Generalization relationship: An inheritance relationship that represents a gener

1. IntroductionIt has been two years since I began to learn programming from a freshman year. From the initial study of the Html,js,javese, to Javaee,android, I can also write some toys. The learning process also unconsciously understood some of the so-called design Patterns , and now intends to learn the system. Learn to book the art of Design mode----------------------the software developer. The so-called design patterns, that is, the predecessors o

When you use Microsoft Visio to draw a use case diagram today, you find that the include relationship is not found in the Visio UML use case, which is the "arrow" + "Finally, a workable solution was found:First: Open the UML Model diagram, software and database, Microsoft vi

The use case diagram is mainly used to illustrate the main event process of the system. It is mainly used to describe the customer's needs, that is, the user wants the system to complete certain functional actions, the general understanding of use cases is the functional module of the software, so it is the starting point of the design system analysis phase. The designer creates and explains the use case

Relationship between classes (1)In a software system, classes do not exist independently. Classes and classes have various relationships. for different types of relationships, UML provides different representations.1. AssociationAssociation is the most common relationship between a class and a class. It is a structured relationship used to indicate the relationship between a Class Object and another class o

Php design pattern-UML class diagram. Preface I have been using php for more than two years. I have prepared and written some frequently-used design patterns based on my own practical experience. of course, I should first understand the design patterns before using the design patterns. I have been using php for more than two years. I have prepared to write frequently-used design patterns based on my own pra

I,Description of the use case diagram Use Case (Use Case) Refers to the interaction between the system's external things (activists, devices, or external systems) and the system. It expresses the functions of the system, that is, the services provided by the system. A Use Case chart is a visualization tool used to describe use cases. It uses simple graphical elements to represent the system's activists, use cases, and their relationships, accurate

In the UML 9 kinds of diagram, the use case diagram is the more important one kind of diagram, it is the diagram which produces in the system analysis stage, from the function carries on the analysis to the system the model, has played the strategically advantageous position

First, the concept of a deployment diagramThe so-called deployment diagram, translated into English is Deployment Diagram, which is used to display the system software and hardware physical architecture. From the deployment diagram, we can learn about the physical relationships between

Class digraphs are the most commonly used diagrams in UML. A class, which is a rectangle at a distance and a rectangle at a closer look, but sometimes a rectangle or a set of two or three rectangles. A class usually has some attributes and methods. The class diagram is shown as follows: This class chart consists of three rectangles, including class names, attribut

Use case diagram (Use Case daigrams) The Use Case view of UML is the view of the external feature description of software products. It describes the demand for software products from the user's perspective rather than the developer's width, and analyzes the functions and dynamic behavior required by the product. The

Currently the more popular UML modeling tools include Visio, Rational Rose, PowerDesigner, EA, and so on, basically enterprise-class software, powerful, I have only used Visio, so do not add to their characteristics or similarities and differences. For more formal scenarios, such as graphics as part of a project document, the software listed above is recommended.