UML状态图在DO和输入之间的差异
我真的不明白进入和进行UML状态图中的活动之间的区别
如果我的状态称为CREATE帐户，并且该州要求用户输入他的姓名，ID和密码，
则 活动 ？
i really don't understand the difference between entry and do activities in UML state diagram
if i have state called create account and this state ask from user to enter his name,id and password
so enter name , id , password is entry activity or do activity ?
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不同之处在于，进入行为始终运行到完成，而DO行为仅在没有事件触发过渡的情况下才能完成。此事件将被打断。因此，它可能具有无尽的循环。如果效果 - 或出口行为具有如此无尽的循环，则statemachine将不再对事件做出反应。
作为旁注：
创建帐户不是状态的好名称，因为它包含一个活动动词。这更适合一项活动。状态可以命名创建帐户。入门行为可以是创建帐户，这可以包括操作输入名称，输入ID 和输入密码。您还应该对用户取消创建的可能性进行建模。与Guards[帐户创建]和[取消]的两个完成过渡可以显示接下来会发生什么。The difference is that the entry behavior is always run to completion, whereas the do behavior is only run to completion if no event triggers a transition. It will get interrupted by this event. Therefore, it could have an endless loop. If an effect-, do- or exit-behavior has such an endless loop, the statemachine will not react to events anymore.
As a sidenote:
create accountis not a good name for a state, since it contains an active verb. That is better suited for an activity. The state could be namedcreating account. The entry-behavior could becreate accountand this could include actionsenter name,enter idandenter password. You should also model the possibility, that the users cancels the creation. Two completion transitions with guards[account created]and[canceled]could show what happens next.