Question

I'm looking to calculate grades that allows me to enter a number of grades and allows me to also calculate the average using java script collections/array list. If possible, can someone lead me in the direction on how to go about doing this with some explanation. Thank you !!!

My code so far;

package com.company;

import java.util.*;
import java.util.ArrayList;

class Main {

    public static void main(String args[]) {

        Set names = new HashSet();
        names.add("Christopher");
        names.add("Pedro");
        names.add("James");
        names.add("Jess");
    }
}

Answer 1

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class Test {
  
//method to calculate the average of grades in ArrayList
static double calAverage(ArrayList<Integer> a)
{
int n =a.size();
  
int sum =0;//to store sum
for(int i=0;i<n;i++)//calculating sum of all grades
sum=sum+a.get(i);
  
//finding average
double av = sum/(n*(1.0));
return av;//returning average
}

public static void main(String argv[])
{
ArrayList<Integer> R = new ArrayList<Integer>();//creating array list with integer object
  
int n;//to store number of grades
//to read input
Scanner sc = new Scanner(System.in);
  
System.out.print("Enter number of grades you to enter:");
n = sc.nextInt();
  
//reading grades
System.out.println("Enter grades :");
for(int i=0;i<n;i++)
{
int k =sc.nextInt();
R.add(k);//adding to array list
  
}
  
//displaying output
System.out.println("The average of grades :"+calAverage(R));
}
}

output:

run:
Enter number of grades you to enter:5
Enter grades :
80
74
69
55
92
The average of grades :74.0
BUILD SUCCESSFUL (total time: 16 seconds)