Introduction In state machines (sequence of states), we use events to model the occurrence of a stimulus that can trigger an object to move from one state to another state. Events may include signals, calls, the passage of time or a change in state. In UML, each thing that happens is modeled as an event. An event is the specification of a significant occurrence that has a location in time and space. A signal, passing of time and change in state are asynchronous events. Calls are generally synchronous events, representing invocation of an operation. UML allows us to represent events
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What are events and signals in UML
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