In your program code, you call: 

$student1->add_courses(["C++", "Java"]);

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In the module, add_courses() puts the arrayref (["C++", "Java"]) into $courses. In the next line, you put $courses into another arrayref. This line should read 

$self->{"Course(s)"} = $courses;

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which equates to 

$self->{"Course(s)"} = ["C++", "Java"];

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Now, in show_student(), print @{$self->{"Course(s)"}}, "\n"; should print: C++Java

You'll probably want to improve that output. There's many ways to do this; here's one example: 

print join(', ', @{$self->{"Course(s)"}}), "\n";

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-- Ken

In reply to Re: Nested Data Structures, OOP by kcott
in thread Nested Data Structures, OOP by programmer.perl

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