Explanation of Solution
Adding the “runningTotal” methods in “ArrayIntList” class:
//definition of "ArrayIntList" class
public class ArrayIntList
{
//declare the required variables
private int[] elementData;
private int size;
//refer the remaining methods in the textbook
//definition of "runningTotal" method
public ArrayIntList runningTotal()
{
//create an object for the "ArrayIntList" class
ArrayIntList result = new ArrayIntList(elementData.length);
//check the "size" is greater than 0
if (size > 0)
{
//call the method
result.add(elementData[0]);
//iterate "i" until reaches its size
for (int i = 1; i < size; i++)
{
/*call the method and find the result*/
result...
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