UML状态机图技术问询：动作可在状态内及转换过程中执行的表述是否正确？

Absolutely, this statement is 100% correct within the technical definition of UML state machines. Let me break down how actions function in both contexts clearly:

• Actions executed inside states
  UML states are designed to handle actions tied to their lifecycle:

  • entry actions: Run the moment the state is entered, before any other activity in the state begins.
  • do activities (a specialized long-running action): Operate while the state is active, continuing until the state is exited or an interrupt occurs.
  • exit actions: Execute right as the state is being left, as part of the process of transitioning out.

• Actions executed during state transitions
  When a transition between two states is triggered (by an event, satisfied guard condition, etc.), you can attach an effect action directly to the transition itself. This action runs after the source state's exit action (if one exists) and before the target state's entry action. It's explicitly tied to the act of moving from one state to another.

In short, states manage actions linked to their own existence and activity, while transitions handle actions that are part of the "jump" between states—both are fundamental, defined parts of UML state machine semantics.

内容的提问来源于stack exchange，提问作者Mhamad Ali Hariri