attending a university and decide a career, which do you think should go first?

For university students, whether they should decide their career, what they should do in the future first and then go to the university having class OR taking some courses first and then decide their career?

I think you should take some courses first and then decide their career. Think about how many times you've changed your mind. If you explore first, and see what you are interested in then you would be more sure of the career you want to pursue. It is better to explore first, than go through the stress of changing your major/career after you realize how uninterested you are. Find what you are most happy doing.

Apparently, students have to decide which career they will pursue before going to the university to prepare enough qualifications for it. :D
They need to have the initiative to make the right choices and commitment to achieve their ultimate aims.