Getting attribute values from a self-closing element using Simple XMLframework and java

I'm trying to get the attribute values of the course element(grades="" & weight=""). As i understand the situation the course names and grades are already mapped to that specific person. What i would like to get out of this is a list of students, grades and weight of grade for each individual (ie. studentName="Joe" + joesGrades="2,5,4" + weightOfcourse="2,4,3").

And after i have the data mapped i would like to calculate the individual weighted average grade of the student. And thats my second question. How do i do that !? It's really beyond me. How do i link together 3 different kinds of lists ?

I'm guessing it should be a two dimensional array or something similar ?

This is what i have so far:

for (Student student : uni.students.student) {

                System.out.println(student.getStudentName() + student.studentCourses.getAllStudentCourses());
            }

Outputs :

Joe[Course [courseName=XML, weight=2, grade=2], Course [courseName=Java, weight=4, grade=5], Course [courseName=SQL, weight=3, grade=4]]

Jack[Course [courseName=XML, weight=2, grade=2], Course [courseName=Java, weight=4, grade=5], Course [courseName=SQL, weight=3, grade=4]]

Jane[Course [courseName=XML, weight=2, grade=2], Course [courseName=Java, weight=4, grade=5], Course [courseName=SQL, weight=3, grade=4]]

The XML that i deserialize:

<uni>
<students>

   <student>
    <studentName>Joe</studentName>
        <studentCourses>
            <course name="XML" weight="2" grade="2" />
            <course name="Java" weight="4" grade="5" />
            <course name="SQL" weight="3" grade="4" />
        </studentCourses>
   </student>

   <student>
    <studentName>Jack</studentName>
        <studentCourses>
            <course name="XML" weight="2" grade="2" />
            <course name="Java" weight="4" grade="5" />
            <course name="SQL" weight="3" grade="4" />
        </studentCourses>
   </student>

   <student>
    <studentName>Jane</studentName>
        <studentCourses>
            <course name="XML" weight="2" grade="2" />
            <course name="Java" weight="4" grade="5" />
            <course name="SQL" weight="3" grade="4" />
        </studentCourses>
   </student>

</students>
</uni>

StudentCourses class

import java.util.List;

import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Root;



@Root(name="studentCourses", strict=false)
public class StudentCourses {

    @ElementList(name="course", inline=true)
    public List<Course> course;

    public StudentCourses(){}

    public List<Course> getAllStudentCourses(){
        return course;

    }


}

Course class

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;

@Element(name="course")
public class Course {

    @Attribute(name="name", required=false)
    public String courseName;

    @Attribute(name="weight")
    public int weight;

    @Attribute(name="grade")
    public int grade;

    public Course () {}

    public  String getCourseNames (){
        return courseName;
    }

    public int getCourseGrades (){
        return grade;
    }

    @Override
    public String toString() {
        return "Course [courseName=" + courseName + ", weight=" + weight
                + ", grade=" + grade + "]";
    }   
}

Deserializer

import java.io.File;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;


public class Deserializer {

    public static void main(String[] args) throws Exception {

        Serializer serializer = new Persister();
        File studentsXML = new File("stud.xml");

         Uni uni = serializer.read(Uni.class, studentsXML);


            for (Student student : uni.students.student) {

                System.out.println(student.getStudentName() + student.studentCourses.getAllStudentCourses());
            }



    }

}