UML Diagrams

Page Flow Diagram

• Page flow diagram describes how users goes from one page to next page.
• Page flow diagrams can be used as a basics for designing the servlets and JSP.

Sequence Diagram

• Sequence diagrams are a type of UML diagrams that show how objects in a system or classes within a code interact with each other.
• Particularly these diagrams show interaction in the order they take place in other words they show the sequence of events.
• They are primarily used by developers and business professionals to document processes or understand the requirements of a new program.
• We require a topic first for which we will create a diagram.
• Think up off all the parts of your topic.
• We can also diagram a system, and we can also diagram a code accordingly.
• For example, if our topic is, we need to analyze availability of a car parts from scrapped cars available across warehouses in different locations.
• So I have to get my old car repaired who’s model was discontinued long ago and now the parts are unavailable too. The only option is to look for parts in scrapped, similar model, cars, across different shops in city.
• Now that, our topic is defined let us define our first activity, and we will create a sequence diagram out of it.
• We download last five years of work order data of workshops.
• Next, we identify shops where this model car was repaired.
• Next, we download more refined data of those work orders, particularly related to our product.
• Here the workshop, work order, and our car are objects and person who will be interacting with these is an actor.
• Note that workshop, work order, and our car, all belong to system, where, as the person is external to the system.
• In a sequence diagram actor, are represented by stick, figures, and objects are represented by rectangles.