int sumOfAll = sumOfArray(arr1) + sumOfArray(arr2) + sumOfArray(arr3)
public int sumOfArray(int[]... ary) {
/// your code
}
int sumOfAll = IntStream.of(arr1).sum() + IntStream.of(arr2).sum() + IntStream.of(arr3).sum();
String textString = getString(R.string.total_coffee_cost, numberOfCoffees, numberOfCoffees * priceOfCup, param3, param4);
priceMessage.setText(textString);