How can I get average score for students from a course ? (java)

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Java

So I have this Course.java

import java.time.LocalDate;
import java.util.ArrayList;


public class Course {

    

private String name;
private LocalDate startDate;
private LocalDate endDate;
private ArrayList<Students> studentList;



public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public LocalDate getStartDate() {
    return startDate;
}
public void setStartDate(LocalDate startDate) {
    this.startDate = startDate;
}
public LocalDate getEndDate() {
    return endDate;
}
public void setEndDate(LocalDate endDate) {
    this.endDate = endDate;
}




public ArrayList<Students> getStudentList() {
    return studentList;
}
public void setStudentList(ArrayList<Students> studentList) {
    this.studentList = studentList;
}


public Course(String name, LocalDate startDate, LocalDate endDate) {
    this.studentList = new ArrayList<Students>();
    this.name = name;
    this.startDate = startDate;
    this.endDate = endDate;

    
}

public boolean addStudent(Students student){
    if (student==null || studentList.contains(student)) {
        return false;
    }
    studentList.add(student);
    return true;
}





public Course(){
    
}


@Override
public String toString() {
    return "Course [name=" + name + ", startDate=" + startDate + ", endDate=" + endDate + ", studentList="
            + studentList + "]";
}

And I have Students.java

public class Students {
    private int studentId;
    private String name;
    private Integer age;
    private String gender;
    private Integer score;
    
    

    
    
    public int getStudentId() {
        return studentId;
    }



    public void setStudentId(int studentId) {
        this.studentId = studentId;
    }



    public String getName() {
        return name;
    }



    public void setName(String name) {
        this.name = name;
    }



    public Integer getAge() {
        return age;
    }



    public void setAge(Integer age) {
        this.age = age;
    }

    

    public String getGender() {
        return gender;
    }



    public void setGender(String gender) {
        this.gender = gender;
    }



    public Integer getScore() {
        return score;
    }



    public void setScore(Integer score) {
        this.score = score;
    }






    public Students(int studentId, String name, Integer age, String gender, Integer score) {
        super();
        this.studentId = studentId;
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.score = score;
    }



    public Students(){

    }
    
    @Override
    public String toString() {
        return "studentId=" + studentId + ", "
                + "name=" + name + ", age="
                + age + ", gender=" + gender + ", score=" + score + "]";
    }
    
    
}

Also the main class

Course Math = new Course("Math",LocalDate.of(2021,Month.JULY,29),LocalDate.of(2023,Month.APRIL,29));
  Math.addStudent(new Students(1, "Michael Jordan", 36,"male",8));
  Math.addStudent(new Students(2, "Peppi Amiran", 26,"male",6));
  Math.addStudent(new Students(3, "Phinehas Waldo", 17,"male",10));
  Math.addStudent(new Students(4, "Catrinel Floriana", 32,"female",8));

  Course Java = new Course("Java",LocalDate.of(2021,Month.JUNE,12),LocalDate.of(2022,Month.SEPTEMBER,15));
  Java.addStudent(new Students(5,"Cornelia Oana",20,"female",7));
  Java.addStudent(new Students(6,"Ovidiu Laura",20,"female",10));
  Java.addStudent(new Students(7,"Rozalia Augustin",20,"Male",10));
  Java.addStudent(new Students(8,"Iulian Apostol",20,"female",10));
  Java.addStudent(new Students(9,"Timotei Emanuel",20,"Male",10));

  Course Python = new Course("Python",LocalDate.of(2021,Month.JUNE,12),LocalDate.of(2022,Month.DECEMBER,29));
  Python.addStudent(new Students(10,"Emanuela Laura",20,"female",7));
  Python.addStudent(new Students(11,"George Iacob",20,"male",7));
  Python.addStudent(new Students(12,"Filimon Nelu",20,"male",7));
  Python.addStudent(new Students(13,"Ioan Ilie",20,"male",7));


  List <Course> courseList = new ArrayList<Course>();
  courseList.add(Math);
  courseList.add(Java);
  courseList.add(Python);

A student should have their basic details along with course details: course name, start and end dates, which it does.

Now, I need to print the average score of all students for a given course name, and I don't know how can I do it. (Bonus for using streams)

What I have tried:

I've tried everything that crossed my mind.