Each use case is some service or unit of functionality provided by system to the external user (actor).
First, define what is the system. For example, system is Bank ATM.
Second, define user of that system. For example, a Customer of that bank.
Now, the use case is some complete service that the user wants from the system.
Examples of use cases for the system and user above would be Check Balances, Withdraw Cash, Deposit Funds,etc.
In UML, you can identify a use case by looking for a specific notation on the diagram. A use case is represented as an ellipse with a name inside it, usually describing a specific function or goal of the system. It should be clear, concise, and focused on the primary actions or interactions that the system needs to perform in response to an actor's request.
uml diagram for calculator
By convention, all upper-case is used to identify macros and single capitals to identify template parameters. However, programmers are free to use upper-case as they see fit.
Sequence diagram (UML), activity diagram (UML), traditional flow chart (may be more...)
Use Case diagrams are behavior diagrams of UML used to describe a set of actions (Use Cases) that some system or systems (Subject) should or can perform in collaboration with one or more external users of the system (Actors).Each use case should provide some observable and valuable result to the actors or other stakeholders of the system.Use case diagrams are a means for specifying:(external) requirements on a system under design, required usages of a system - to capture what a system is supposed to do;the functionality offered by existing system -- what system can do for clients;requirements the specified system poses on its environment - by defining how environment should interact with the system so that it will be able to perform its services.
In general, the differences are that interface has(1) no fields and(2) no implementation of methodsbut in UML interface may have features (fields), so the difference left is that interface in UML has no implemented methods while abstract class by definition is partially implemented class.
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UML supports Object Oriented Analysis and Design (OOAD). It has all related concepts like classes, objects, inheritance, encapsulation, polymorphism, etc. UML is most suitable for use case driven, iterative and incremental development processes as most OOAD processes are.
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UML is well known by business analysts and software developers. If your website intended audience is related to software design, use UML. If your website audience is common non technical people, never use UML but PowerPoint or podcasts.
Use case UML diagrams depict functionality (use cases) offered by a system (subject) from a point of view of external user (actor), what designed or existing system can or is supposed to do for external users of the system.See examples of use case diagrams in the related link.
with hand use program visual paradigm community edition (free) for uml. You can get in a few minutes beautifull uml pictures
It's uml base model usely use of use case design and spiral model Risk driven approchs
We use database to manage and store the information. UML in database stands for unified modelling language. The structure or designing of the database can be done through unified modelling language.
The latest version of UML is UML 2.4 (beta), released in January 2011.
You can find several examples of UML diagrams - use cases, components, activities, communication, deployment - for e-shopping in the provided link.
UML has high learning curve.