10 Questions
What notation is used to represent a self transition in a state machine diagram?
A solid arrow pointing back to the state
Which notation is used to represent a composite state in a state machine diagram?
A rounded rectangle
What is the final step in drawing a State Machine Diagram in UML?
Draw the diagram with appropriate notations
What is the main difference between a State Machine Diagram and a Flowchart?
A State Machine Diagram shows the different situations a system can be in, while a Flowchart shows the steps to solve a problem
What notation is used to represent the final state in a state machine diagram?
A filled circle within a circle
What is the primary purpose of a State Machine Diagram?
To represent the behavior of a system using finite state transitions
Which notation is used to represent a Fork in a State Machine Diagram?
A rounded rectangular bar
What does a transition represent in a State Machine Diagram?
The change of control from one state to another
Which notation is used to represent the initial state in a State Machine Diagram?
A black filled circle
What does a Join represent in a State Machine Diagram?
The merging of two or more states into a common goal state
Study Notes
State Machine Diagram in UML
- A state diagram is used to represent the condition of a system or part of a system at finite instances of time.
- It's a behavioral diagram that represents behavior using finite state transitions.
Basic Components and Notations
- Initial State: represented by a black filled circle, indicating the initial state of a system or class.
- Transition: represented by a solid arrow, indicating the change of control from one state to another, labeled with the event that causes the change in state.
- State: represented by a rounded rectangle, indicating the conditions or circumstances of an object of a class at an instant of time.
- Fork: represented by a rounded solid rectangular bar, indicating a state splitting into two or more concurrent states, with incoming arrow from the parent state and outgoing arrows towards the newly created states.
- Join: represented by a rounded solid rectangular bar, indicating a state merging into one from two or more concurrent states, with incoming arrows from the joining states and outgoing arrow towards the common goal state.
- Self Transition: represented by a solid arrow pointing back to the state itself, indicating that the state of the object does not change upon the occurrence of an event.
- Composite State: represented by a rounded rectangle, indicating a state with internal activities.
- Final State: represented by a filled circle within a circle notation, indicating the final state in a state machine diagram.
How to Draw a State Machine Diagram
- Step 1: Identify the system.
- Step 2: Identify initial and final states.
- Step 3: Identify possible states.
- Step 4: Label triggering events.
- Step 5: Draw the diagram with appropriate notations.
Use Cases and Differences
- Use Cases: State Machine Diagrams are used for designing software or explaining how something works.
- Difference between State Machine Diagram and Flowchart: A flowchart is a picture that shows a set of clear instructions to solve a problem, whereas a State Machine Diagram shows the different situations a system can be in and how it moves between them.
Test your knowledge on State Machine Diagrams with this quiz. Learn about how state diagrams represent the condition of a system at finite instances of time, using finite state transitions. Explore the behavior of systems through this behavioral diagram.
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