run configuration· SchoolCourseEnrolmentSystem.main()

Run the program

The whole application is one loop in main(). Follow it from start-up to exit, or run it right here: the console below replays the report's code against sample data, quirks included.

what main() does, in order

Start-up to exit#

dataManager.getInstance()
Creates the five empty lists
```
Testing Constructor
```
loadAllData()
Reads the five files in order: students, instructors, administrators, courses, assessments
```
Loading student: …
```
addAdministrator(DefaultAdmin)
Registers the built-in admin and saves administrators.txt
```
Administrator added: Shoug with ID: 1122334455
```

Role prompt

Loops until exit

Enter your role from the current options: (Student/Instructor/Admin) or exit to finish.

Helpers.login<T>()
ID, then up to three password attempts
```
Please enter your ID:
```
Role menu loop
Runs until the user picks Logout
```
---------Student Menu---------
```
exit
saveAllData() writes all five files
```
Goodbye.
```

sample data, runs in your browser

Interactive console#

Commands are typed exactly as in the Java program. Try student, then 2200000001 and Student1234. Use the Files tab to compare what is on disk with what is still only in memory.

Role prompt#

Typing anything other than these four words prints Invalid role. Try again. The match ignores case and only reads the first word.

student8 options · Student2200000001 / Student1234instructor5 options · Instructor4000000001 / Teacher1234admin14 options · Administrator1122334455 / Default12345

exitsaveAllData(), then “Goodbye.”

Exit & errors#

Clean exit

Typing exit sets the loop flag, calls saveAllData() to write all five files, prints Goodbye. and lets main() return.

Unexpected error

One try/catch (Exception e) wraps the whole loop. If anything escapes the inner handlers it prints Error: <message> and the program ends without saving.

Every guard and handler is listed on Validation & errors.