How to use a variable of one class, in another in Java?

Question

I\'m just working through a few things as practice for an exam I have coming up, but one thing I cannot get my head round, is using a variable that belongs to one class, in

Answer 1

As mentioned, stay away from the "extends" for this. In general, you shouldn't use it unless the "is-a" relationship makes sense.

You should probably provide getters for the methods on the Course class:

public class Course {
   ...
   public String getTitle() {
       return title;
   }
}

And then if the Student class needs that, it would somehow get a hold of the course (which is up to you in your design), and call the getter:

public class Student {
   private Set courses = new HashSet();

   public void attendCourse(Course course) {
       courses.add(course);
   }

   public void printCourses(PrintStream stream) {
       for (Course course : courses) {
           stream.println(course.getTitle());
       }
   }
}