A use case outlines a specific goal and how to achieve that goal.
A use case diagram is a graphical representation of system users(actors), use cases, and the system (subject) to which this set of use cases applies.
In more detail:
Use CaseA use case outlines an interaction between an actor and a system (or a system and a system). For example, the interaction (or dialog) of someone accessing an ATM would look as follows:
Use case name: Authenticate user
1. ATM displays welcome message to Customer
2. ATM asks user to insert card
3. Customer inserts card into ATM
4. ATM asks user to enter their PIN
5. Customer enters their PIN
6. ATM authenticates the customer using the information from the card and the PIN
A use case is functional and outlines the behavior of a set of interactions that form a coherent dialog in the system, i.e. Authenticate user. This interaction is separate and distinct from the use case Withdraw money, which also involves a series of interactions.
Use Case DiagramA use case diagram shows the relationship between the actors and the use cases. For example, on the Use Case diagram for an ATM you would have the following relationships:
CustomerA set of use cases can be used to specify scope in a system.
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A sequence diagram in a Unified Modeling Language (UML) is a kind of interaction diagram that shows how processes operate with one another and in what order. It is a construct of a Message Sequence Chart. A sequence diagram shows object interactions arranged in time sequence. It depicts the objects and classes involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario. Sequence diagrams typically (but not always), are associated with use case realizations in the Logical View of the system under development.
There is always a difference between technology in leadership and followers. Leaders always lead while followers always follow in the use of technology.
A use case is a list of steps used to achieve a goal in software and systems engineering. It defines interactions between a role (known as an "actor") and a system.
the include relationship implies that the included use case must be enacted, whereas the extend relationship implies that the extending use case may be enacted.
It is a hybrid between Use Case and Sequence Diagram
Activity diagram shows the work flow from start point to the end point detailing many decision points. Sequence shows detail flow of specific use case and it also shows interaction between actors, system and system components
i want use case diagram for online banking system
Use case diagrams are used foe better understanding of software. They have actors , use cases and relation between them.
sample human resource managment use case diagram
i want use case diagram for online voting system
Class diagram is UML structure diagram which shows structure of the designed system at the level of classes and interfaces, shows their features, constraints and relationships - associations, generalizations, dependencies, etc.Communication diagram (called collaboration diagram in now obsolete UML 1.x) is an interaction diagram which shows interactions between objects and/or parts (represented as UML lifelines) using sequenced messages in a free-form arrangement.So, the major difference is that class diagram shows static structure of the system while communication (collaboration) diagram shows system behavior as sequenced exchange of messages between objects.
The main difference between use cases and class diagrams is that a diagram shows how data is related. On the other hand, use cases show how a user uses a system.
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sample of use case diagram represent the business process of GeneralMotors
E-R diagram for Airline management system is in the related links.