There can only be one transition out of the initial state, and the operation specified for this transition should only be used this once.
初始状态传出的转换只能有一种,而且为此转换指定的操作只应使用这一次。
A composite state can also have a default transition with no operation.
组合状态还可以具有不带操作的缺省转换。
You can have more than one transition from a state associated with the same operation (or with no operation); however, in this case, each transition must have a guard.
您还可以具有多个来自一个与同一操作关联(或不与任何操作关联)的状态的转换;但在此情况下,每个转换必须具有一个监护。
应用推荐