What is the notation of a create message?

What is the notation of a create message?

• A. Dashed line with an open arrowhead. The tail end is connected to sending lifeline and the arrowhead end of the message is connected to the head of a lifeline that is getting created
• B. Solid line with a filled arrowhead
• C. Dashed line with a closed arrowhead
• D. Solid line with an open arrowhead

Answer: (A)

In a sequence diagram, a create message is used when an operation results in a new object coming into existence. It is drawn as a dashed line ending in a hollow (open) arrowhead that points to the lifeline of the object being created, and that lifeline begins at that point. This distinguishes creation from ordinary calls, which are shown with a solid line and a filled arrowhead. The other dashed-line option with a filled arrowhead and the solid-line options do not represent creation, since they indicate different kinds of messages or interactions.

In a sequence diagram, a create message is used when an operation results in a new object coming into existence. It is drawn as a dashed line ending in a hollow (open) arrowhead that points to the lifeline of the object being created, and that lifeline begins at that point. This distinguishes creation from ordinary calls, which are shown with a solid line and a filled arrowhead. The other dashed-line option with a filled arrowhead and the solid-line options do not represent creation, since they indicate different kinds of messages or interactions.