simpe average in java for beginners

Average.java

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class Average {
    public static void main(String[] args) {
        ArrayList<Student> students= new ArrayList<>();

        Student amir = new Student(12.0, 12.5, 19.0, 20.0);
        Student ali = new Student(15.5, 13.25, 14.0, 5.5);
        Student elham = new Student(16.0, 17.5, 17.0, 20.0);
        Student azam = new Student(15.0, 18.5, 17.0, 19.0);

        students.add(amir);
        students.add(ali);
        students.add(elham);
        students.add(azam);

        ArrayList<Double> aveScores=new ArrayList<>();
        for (Student student : students) {
            aveScores.add(ave(student.scores));
        }

        System.out.println("average of all student scores is:");
        System.out.println(ave(aveScores));
    }
    public static double ave(List<Double> nums) {
        double sum = 0;
        for (double n : nums) {
            sum += n;
        }
        return sum / nums.size();
    }
    public static class Student{
        public List<Double> scores=new ArrayList<>();
        public Student(Double... scores){
            this.scores.addAll(Arrays.asList(scores));
        }
    }
}