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State chart diagram

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Preeti Mishra

State chart diagrams define the different states an object can be in during its lifetime, and how it transitions between states in response to events. They are useful for modeling reactive systems by describing the flow of control from one state to another. The key elements are initial and final states, states represented by rectangles, and transitions between states indicated by arrows. State chart diagrams are used to model the dynamic behavior and lifetime of objects in a system and identify the events that trigger state changes.

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State Chart DiagramState Chart Diagram Preeti Mishra Course Instructor
Introduction • They define different states of an object during its lifetime. States are defined as a condition in which an object exists and it changes when some event is triggered • These states are changed by events. • . So the most important purpose of Statechart diagram is to model life time of an object from creation to termination. • Statechart diagrams are useful to model reactive systems -Reactive systems can be defined as a system that responds to external or internal events. • Statechart diagram describes the flow of control from one state to another state.
Purpose • Following are the main purposes of using Statechart diagrams: • To model dynamic aspect of a system. • To model life time of a reactive system. • To describe different states of an object during its life time. • Define a state machine to model states of an object.
How to draw state charts • Before drawing a Statechart diagram we must have clarified the following points: • Identify important objects to be analyzed. • Identify the states. • Identify the events.
Elements of state chart diagrams: • Initial State: This shows the starting point of the state chart diagram that is where the activity starts. • State: A state represents a condition of a modeled entity for which some action is performed. The state is indicated by using a rectangle with rounded corners and contains compartments. • Transition: It is indicated by an arrow. Transition is a relationship between two states which indicates that Event/ Action an object in the first state will enter the second state and performs certain specified actions. • Final State: The end of the state chart diagram is represented by a solid circle surrounded by a circle.
State chart diagram
When to use Statecharts • So the main usages can be described as: • To model object states of a system. • To model reactive system. Reactive system consists of reactive objects. • To identify events responsible for state changes. • Forward and reverse engineering.
State chart diagram

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State chart diagram

  • 1. State Chart DiagramState Chart Diagram Preeti Mishra Course Instructor
  • 2. Introduction • They define different states of an object during its lifetime. States are defined as a condition in which an object exists and it changes when some event is triggered • These states are changed by events. • . So the most important purpose of Statechart diagram is to model life time of an object from creation to termination. • Statechart diagrams are useful to model reactive systems -Reactive systems can be defined as a system that responds to external or internal events. • Statechart diagram describes the flow of control from one state to another state.
  • 3. Purpose • Following are the main purposes of using Statechart diagrams: • To model dynamic aspect of a system. • To model life time of a reactive system. • To describe different states of an object during its life time. • Define a state machine to model states of an object.
  • 4. How to draw state charts • Before drawing a Statechart diagram we must have clarified the following points: • Identify important objects to be analyzed. • Identify the states. • Identify the events.
  • 5. Elements of state chart diagrams: • Initial State: This shows the starting point of the state chart diagram that is where the activity starts. • State: A state represents a condition of a modeled entity for which some action is performed. The state is indicated by using a rectangle with rounded corners and contains compartments. • Transition: It is indicated by an arrow. Transition is a relationship between two states which indicates that Event/ Action an object in the first state will enter the second state and performs certain specified actions. • Final State: The end of the state chart diagram is represented by a solid circle surrounded by a circle.
  • 7. When to use Statecharts • So the main usages can be described as: • To model object states of a system. • To model reactive system. Reactive system consists of reactive objects. • To identify events responsible for state changes. • Forward and reverse engineering.