Methods.java

// Program to return average of numbers
public static double doAverage(ArrayList<Integer> marks) {
	// double for more precision than Integer during division
	double avg = 0.0;
	
	for(int mark: marks) {
		avg += mark;
	}
	// size() method returns the number of elements in array
	avg = avg/marks.size();
	
	return avg;
}

public static void main(String[] args) {
	
	ArrayList<Integer> marks = new ArrayList<>(List.of(95,96,98));
	
	// static methods can be accessed directly without creating a class object
	// Here class name is Methods
	double avg = Methods.doAverage(marks);
	
	System.out.println(avg);
}