Sequence Diagram for Making a Hotel Reservation using UML

A sequence diagram is a type of UML (Unified Modeling Language) diagram that represents the order in which objects interact with each other. In this article, we will explore how to create a sequence diagram for making a hotel reservation.

The Activation Bar and Lifelines

In a sequence diagram, the activation bar represents the duration of execution of a message. An arrow goes from the sender to the top of the activation bar of the message on the receiver's lifeline. A vertical dotted line, or lifeline, represents the time that an object exists.

The Sequence Diagram for Making a Hotel Reservation

In this sequence diagram, we will look at how a user can make a hotel reservation through a UserInterface. The objects involved in the operation are listed from left to right according to when they take part in the message sequence. Here is what happens:

1. The UserInterface sends a makeReservation() message to a HotelChain.

2. The HotelChain then checks if it has available rooms. If so, it makes a Reservation and a Confirmation.

How Sequence Diagrams Work

Sequence diagrams are organized according to time, which means that as you go down the page, the time progresses. In contrast, interaction diagrams are dynamic, describing how objects collaborate. A sequence diagram is an interaction diagram that details how operations are carried out: what messages are sent and when.

In summary, a sequence diagram provides a visual representation of the order in which objects interact with each other during a specific operation or scenario. By using UML, we can create diagrams that help us understand complex systems and interactions more effectively.

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