e. Activity Diagram Design
Activity diagrams describe the workflow behavior of a system. Activity diagrams are similar to state diagrams because activities are the state of doing
something. The diagrams describe the state of activities by showing the sequence of activities performed. Activity diagrams can show activities that are
conditional or parallel. Following the writer showing activity diagram for use case model
Picture 4.7 Activity diagram
for printing Surat in Certificate Vending Machine
User will insert their username and password to the certificate vending machine, thus the form login appear at first and the input data will check for
process login; if the username and password was correct the status of students or alumni will send back to the language selection, which the actor can choose
between English language and Indonesia language, then choosing the required letters for print, according to user data; process of print appear, RFID for taken
the payment of the surat will appear and the process will done, and the required letters will print and come out.
f. Sequence Diagram Design
Sequence diagrams describe interactions between objects within and around the system including user, displays, and so on in the form of message
that is described with respect to time. Below is a sequence diagram for each module.
1. Printing Surat letters in Certificate Vending Machine
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.8 Se
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e diagr
am fo
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Ve nding
Students and alumni will insert their username and password to the certificate vending machine, thus the form login appear at first and the
input data will check for process login, in login process the database connection will ready to verify the exact and correct username and
password that’s why username and password will check their validity in user data which is the database that system use; if the username and
password was correct the status of students or alumni will send back to the process login, login status will give information to form login that what
kind of user status already login, after this interaction system will show the main page by showing the selection language, which the actor can choose
between English language and bahasa Indonesia, then choosing the required letters for print, according to user data; process of print appear,
RFID for taken the payment of the surat will appear and the process will done, and the required letters will print and come out.
g. Class Diagram Design
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