#Staruml sequence diagram loop how to
#Staruml sequence diagram loop android

Sequence Diagrams are used to show your team how objects in your program interact with each other to complete tasks. Now it's time for you to learn about Sequence Diagrams.

Explain the tradeoff between cohesion and coupling.

Apply design guidelines for modularity, separation of concerns, information hiding, and conceptual integrity to create a flexible, reusable, maintainable design.

Translate between UML class diagrams and equivalent Java code.

Express object-oriented models as Unified Modeling Language (UML) class diagrams.

Explain the difference between association, aggregation, and composition dependencies.

Explain and apply different types of inheritance.

Explain and apply object-oriented modeling principles and their purpose (e.g., abstraction, encapsulation, decomposition, generalization).

Apply the Class Responsibility Collaborator (CRC) technique to analyze and design the object-oriented model for a problem.

#Staruml sequence diagram loop android

You will be challenged in the Capstone Project to apply your knowledge of object-oriented design by evolving and documenting the Java codebase for an Android application with corresponding UML documentation.Īfter completing this course, you will be able to: And, you will be able to communicate these designs in a visual notation known as Unified Modelling Language (UML).

#Staruml sequence diagram loop how to

You will discover how to create modular, flexible, and reusable software, by applying object-oriented design principles and guidelines. But for 'simple' exception handling, I think a break is a better way to represent it, then alt.This course takes Java beginners to the next level by covering object-oriented analysis and design. ConclusionĪs always, the best method depends on the scenario. This is ofcourse a very simple example, and you can have a lot more interaction in the break interaction operator, like logging or transaction handling. I think it even makes things better, because you can see where a sequence stops when an exception occurs. What I like about this way of displaying exception handling is that it makes the diagram much less cluttered. In this example the exception isn't caught until it enters the UI, in this case the ATM. Using a break interaction operator, it would look something like this: Let's take a look when the situation when something happens, what causes the ATM to decline de withdrawal. When the guard condition is true, the current interaction run is abandoned and the clause in the break interaction operand runs. The break interaction operator is similar to the break mechanism in other programming languages. This looks nice, for a small diagram, but once the diagram starts to grow and you get a lot of nested alt interaction operations, you might start to loose the overview. Using an alt interaction operator, it would look something like this:

The else clause of the alternative combined fragment runs when no other option is selected. If there is no guard, the operand always runs when it is selected. However, as for any operand, the selected operand in the alternative structure runs only if the guard condition tests true.

Only one of the offered alternatives runs on any pass through the interaction. The server confirms the withdrawal is approved and, the service passes this on to the ATM's UI and the ATM dispenses the money.Īn alternative interaction operator represents the logic equivalent of an if-then-else statement. The customer enters the data, the ATM calls a service, which calls the bank's server. I'll describe both methods using a classical example: withdraw money from an ATM when the balance is too low. They both use interaction operators, alt and break. 1Īfter searching for quite a while on how to model exception handling in a UML Sequence Diagram I found two ways to represent exception handling in a UML Sequence Diagram. There are several proposed notations for exception handling. Some clumsy approaches to model try-catch blocks are by utilizing combined fragments - alt (alternatives) and breaks, while adding stereotypes for reply messages representing thrown exceptions. UML provides neither notation to model exception handling in sequence diagrams nor any reasoning why it is absent.