Java programming. Critique code on how it can be better. static double calcAverage(ArrayList obj) { Integer count

Java programming. Critique code on how it can be better. 

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static double calcAverage(ArrayList obj) { Integer count = 0; for (int i=0; i < obj.size(); i++) { count+=obj.get(i); } } return count/obj.size(); public static void main(String[] args) { ArrayList list1=new ArrayList (); list1.add(10); list1.add(30); System.out.println(calcAverage(list1)); } static double calcAverage(ArrayList obj) { Integer count = 0; for (int i=0; i < obj.size(); i++) { count+=obj.get(i); } } return count/obj.size(); public static void main(String[] args) { ArrayList list1=new ArrayList (); list1.add(10); list1.add(30); System.out.println(calcAverage(list1)); }