OOP) Grades Analyser version 1

import java.util.ArrayList;

public class GradeAnalyzer {

    //Constructor with no parameters
    public GradeAnalyzer(){
    }

    //Method with an ArrayList as a parameter. Produces error message if there are no elements in the ArrayList.
    public int getAverage (ArrayList<Integer> grades){
        if(grades.size()<1){
            System.out.println("Your array is empty");
            return 0;
        }else {
            int sum = 0;
            //For Each loop. "For each grade in the grades ArrayList..."
            for (Integer grade:grades){
                sum = sum + grade;
            }
            int average = sum / grades.size();
            System.out.println("The average of all of the grades is: " + average);
            return average;
        }
    }

    public static void main(String[] args) {
        //Create a new ArrayList (same process as creating a new instantiated object from your class)
        ArrayList<Integer> myClassroom = new ArrayList<>();

        myClassroom.add(98);
        myClassroom.add(92);
        myClassroom.add(88);
        myClassroom.add(75);
        myClassroom.add(61);
        myClassroom.add(89);
        myClassroom.add(95);

        //Create a new GradeAnalyser object, and instantiate
        GradeAnalyzer myAnalyser = new GradeAnalyzer();

        //Call the getAverage method, with the ArrayList as the parameter
        myAnalyser.getAverage(myClassroom);
    }
}