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my computer glitched and all my work got deleted so i had to redo other assigned problems. will be back as soon as i catch back up

Enter student id:1234
Enter course id: 1 for Math, 2 for English1
Students registered for Math:
null
Exception in thread "main" java.lang.NullPointerException
at...

if (courseName.equals("Math"))

i seriously dont see it . im so lost.

now it shows:
Enter student id:1234
Enter course id: 1 for Math, 2 for English2
Students registered for Math:
Exception in thread "main" java.lang.NullPointerException
at...

i am trying to insert 5 students ids and a
course number for each student id. Then it prints all
5 student ids and the course name associated with
each student id.

but im having trouble...