What are the elements in State Chart Diagram?
Below are the elements in the State Chart Diagram,
- Initial State - This state shows the primary movement of the stream.
- State - This state speaks about the state of an object at a specific given point of time.
- Transition - It shows the transition from one state to another state of objects and it is represented by an arrow.
- Event and Action - It is a trigger that causes a transition to occur.
- Signal - When a message or a trigger caused by an event to a state, which causes a transition, this message is called a signal.
- Final State - The state diagram ends with a diagram that depicts a bull’s eye is known as Final State
Sample State chart diagram,
Answer (1)
A state chart diagram, also known as a state machine diagram, is a type of behavioral diagram in UML (Unified Modeling Language) that depicts the various states an object can be in and the transitions between those states. Here are the key elements typically found in a state chart diagram:
State: A state represents a condition or situation during the life cycle of an object. It describes the behavior of an object in response to external events or stimuli. States are depicted as rounded rectangles with the state name inside.
Transition: A transition represents a change of state in response to an event. It depicts the movement from one state to another triggered by a particular event or condition. Transitions are depicted as arrows connecting states, labeled with the triggering event or condition.
Event: An event is a trigger that causes a transition from one state to another. Events can be internal (generated within the system) or external (received from an external source). Examples of events include user actions, system notifications, or changes in data.
Guard Condition: A guard condition, also known as a guard or guard clause, is a Boolean expression that determines whether a transition can occur. It specifies additional criteria that must be satisfied for a transition to be triggered. Guard conditions are typically associated with transitions.
Actions: Actions represent activities or behaviors that occur when a transition is triggered. They specify what happens when an object moves from one state to another. Actions can include computations, updates to attributes, or interactions with other objects.
Initial State: The initial state represents the starting point of the state machine. It indicates the state of the object when it is first created or initialized. In a state chart diagram, the initial state is denoted by a filled circle with an arrow pointing to the initial state.
Final State: The final state represents the end of the state machine's execution. It indicates that the object has reached its final state and no further transitions are possible. In a state chart diagram, the final state is denoted by a filled circle with a dot inside.
These elements are used to model the dynamic behavior of systems and describe how objects transition between different states in response to events and conditions. State chart diagrams are particularly useful for modeling the behavior of complex systems with multiple states and transitions.