In an activity diagram, an object flow indicates that an object is an input for or output by an action. An object flow arrow connects an object flow state either to a control flow arrow or to an action state.
When an object flow arrow supplies a redundant constraint, you can omit the control flow arrow.
Name an Object Flow shape and add other property values
Open the element's UML Properties dialog box by double-clicking the icon that represents the element in the tree view or the shape that represents the element in a diagram.
Control which property values display on a shape in a diagram by right-clicking the shape, and then clicking Shape Display Options. In the UML Shape Display Options dialog box, select and clear options to display or hide property values.