How to use custom class in Laravel?

How to use custom class in Laravel without creating object new Class()?

As sample, I have class Exception I include this like as:

use App\Exception

After in custom class User I can do:

use App\Exception

class User {

    public function check(Exception $e) {
       // 
    }

}

Is it right?

Or I need to create object $e = new Exception() in constructor?

Whats is difference between these kind of initialization?

via Chebli Mohamed