OOP G2

• State Machine Diagram in UML


  A behavioural diagram that represents the different states a system or object can be in, including the transitions between those states triggered by an event
• State Machine Diagram


  • Useful for modelling the behaviour of complex systems, such as software applications or embedded systems, where the behaviour is dependent on the current state and the event received
• Concept


  State Machine Diagram is a graphical representation of a finite state machine(FSM). It's a modelling technique used in computer science, engineering, and various other fields to depict the behaviour of systems with discrete states.
• Key Components


  • State
  • Transition
  • Event
  • Action
  • Initial State
  • Final State
  • Choice pseudostate
  • Event
  • Exit point
  • First state
  • Guard
  • State
  • Terminator
  • Transition
  • Transitional Behavior
  • Trigger
• State


  A condition or situation in which an object or system can exist at a particular point in time
• Transition


  The movement or change of state that occurs in response to certain events or conditions
• Event


  A stimulus or occurrence that triggers a transition from one state to another
• Action


  Tasks or operations that are performed when a transaction occurs
• Initial State


  The starting point of the state machine
• Final State


  The conclusion or termination of the state machine's behaviour
• Choice pseudostate


  A diamond symbol that indicates a dynamic condition with branched potential result
• Event


  An instance that triggers a transition, labelled above the applicable transition arrow
• Exit point


  The point at which an object escapes the composite state or state machine, denoted by a circle with an X through it
• First state


  A marker for the first state in the process, shown by a dark circle with a transition arrow
• Guard


  A Boolean condition that allows or stops a transition, written above the transition arrow
• State


  A rectangle with rounded corners that indicates the current nature of an object
• Terminator


  A circle with a dot in it that indicates that a process is terminated
• Transition


  An arrow running from one state to another that indicates a changing state
• Transitional Behavior


  A behaviour that results when a state transitions, written above the transition arrow
• Trigger


  A type of message that actively moves an object from state to state, written above the transition arrow