Assume the availability of an instance variable arr that refers to an ArrayList of Strings. Write a helper method concatAll that returns the concatenation of all the Strings in the ArrayList in the order in which they appear in the ArrayList

Explanation:

The following code is written in Java and is a method that takes in an ArrayList as a parameter, it then loops through the ArrayList and adds each element to the instance variable called arr as well as a space between each element (this can be removed by deleting the " "). Finally, it prints the final result of the variable arr to the screen.

public static void concatAll(ArrayList<String> myArr) {

       String arr = "";

       for (int x = 0; x < myArr.size(); x++) {

           arr += myArr.get(x) + " ";

       }

       System.out.println(arr);

   }

system programmer option d is correct

because an operating system is software that manages computer hardware and system resources.

yes, but you must first make sure that you'll be able to make your turn or you can crash into other vehicles.