What is active class in class diagram?
An Active Class indicates that, when instantiated, the Class controls its own execution. Rather than being invoked or activated by other objects, it can operate standalone and define its own thread of behavior.
What are active classes in UML?
Active class looks similar to a class with a solid border. Active class is generally used to describe the concurrent behavior of a system. Active class is used to represent the concurrency in a system.
What is active and passive object?
Active objects are one which instigate an interaction which owns a thread and they are responsible for handling control to other objects. Passive objects are one, which passively waits for the message to be processed. It waits for another object that requires its services. In simple words it can be referred as server.
What is class and object diagram in UML?
The class diagram provides an abstract view which comprises of classes and their relationships, whereas the object diagram represents an instance at a particular point of time. The object diagram is actually similar to the concrete (actual) system behavior. The main purpose is to depict a static view of a system.
What is Activity diagram explain with example?
An activity diagram visually presents a series of actions or flow of control in a system similar to a flowchart or a data flow diagram. Activity diagrams are often used in business process modeling. They can also describe the steps in a use case diagram. Activities modeled can be sequential and concurrent.
What is the purpose of the active class?
Class=”active” is usually used to highlight any active content from a selection, mostly in navigation. Let’s say in a website with different page links on navigation, just to indicate that the user is on this page, active class highlights that link increasing the usability of navigation.
What is a passive object in sequence diagram?
Most objects are passive and do not have their own threads of control. Activation shows the time period during which a call of a method is being processed, including the time when the called method has invoked another operation.
What is Activity diagram in UML with example?
Activity diagrams are similar to flowcharts because they show the flow between the actions in an activity; however, activity diagrams can also show parallel or concurrent flows and alternate flows. In activity diagrams, you use activity nodes and activity edges to model the flow of control and data between actions.
What is the object diagram in UML?
A UML object diagram represents a specific instance of a class diagram at a certain moment in time. When represented visually, you’ll see many similarities to the class diagram. An object diagram focuses on the attributes of a set of objects and how those objects relate to each other.
What is an activity diagram in UML?
In UML, an activity diagram provides a view of the behavior of a system by describing the sequence of actions in a process. In activity diagrams, you use activity nodes and activity edges to model the flow of control and data between actions.