State Diagram consist of:
State drawn as rounded rectangle.
Starting Point drawn as a filled circle.
Ending Point drawn as two concentric circles with a filled inner circle.
Transition drawn as arrow.
Event / Trigger is text that written along the Transition arrow.
Internal Behavior is any behavior that happens while the object is in a state. Internal behavior is written as label / behavior. The label indicates when the behavior executes in other words, events or circumstances causing the behavior. There are three special labels: entry, exit, and do.
Internal transition is a transition that causes a reaction within a state, but doesn't cause the object to change states. Internal transitions are written as trigger [guard] / behavior, and they are listed inside a state.
Composite States
Concurent States
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