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For what I can know/understand, at conceptual level, yes a "course" can have many prerequisites, so it has sense to keep id, code, title and N prerequisites (as an array).

And note: your class...

static method toString of java.util.Arrays. It formats an array into a string with a fixed format like [xxx,yyy ...... ]

If you don't like this format, use a simple for loop to print or format a...

Here I see a constructor with 4 parameters but in the new Courses (code,title, prerequisites) you pass 3 arguments.

How many constructors do you have? Several in overload? Then it's ok.


If...

First, your HTML output seems not correct. You should put a " ' " after prerequisites.

out.println("Prerequisite(s): <input type='checkbox' name='prerequisites' value='CS320' >


Since you have...