In a create message, where is the arrowhead end connected?

In a create message, where is the arrowhead end connected?

• A. To the head of the lifeline being created
• B. To the tail of the sending lifeline
• C. To the head of the sending lifeline
• D. To the head of the lifeline already existing

Answer: (A)

In a create message, the arrowhead lands on the head of the lifeline being created. This shows that a new object comes into existence as a result of the message, starting its lifeline at that moment. The tail of the message sits on the sending lifeline, which is just the origin of the call. If the arrow went to the tail of the sender or to a lifeline that already exists, it wouldn’t represent the creation of a new object. So the correct image is the arrowhead connected to the head of the lifeline being created.

In a create message, the arrowhead lands on the head of the lifeline being created. This shows that a new object comes into existence as a result of the message, starting its lifeline at that moment. The tail of the message sits on the sending lifeline, which is just the origin of the call. If the arrow went to the tail of the sender or to a lifeline that already exists, it wouldn’t represent the creation of a new object. So the correct image is the arrowhead connected to the head of the lifeline being created.