Arraylist in Java

import java.util.ArrayList;
 
public class myArrayList {
   public static void main(String[] args) {
      ArrayList<Integer> vals =  new ArrayList<Integer>();
      vals.add(100);
      vals.add(90);
      vals.add(80);
      vals.add(70);
      vals.add(60);
      int total = 0;
      /*for(int i = 0; i < vals.size(); ++i) {
         total += vals.get(i);
      }*/
      for (Integer val : vals) {
         total += val;
      }
      double average = total / vals.size();
      System.out.println("Size of vals: " + vals.size());
      System.out.println("Average: " + average);
      vals.remove(4);
      System.out.println("New size: " + vals.size());
      vals.add(60);
      vals.add(50);
      System.out.println("Newer size: " + vals.size());
   }
}

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