Question

Using Java with no imports,

   Method arrayOfSums returns an ArrayList of the same size as the largest ArrayList
       This method needs to be overloaded so that it works for 2 to 4 sent Arraylists.

       arrayOfSums([2,4,7], [3,7,14]) returns [5,11,21]
       arrayOfSums([6,13,4,8], [7,5,9], [2,5,8,3]) returns [15, 23, 21, 11]
       arrayOfSums([6,13,4,8], [7,5,9], [2,5,8,3], [3,5,4,1,2]) returns [18, 28, 25, 12, 2]
       arrayOfSums([8,6], [2,4,10]) returns [10,10,10]
       arrayOfSums([2,2,2,2,2], [3,2,5,2,3], [1,3,1,3,1]) returns [6, 7, 8, 7, 6]
       arrayOfSums([11,12,13,14], [14,13,12,11], [10,10,10,10], [5,6,7,6,5]) returns [40, 41, 42, 41, 5]
       @param nums1 ArrayList of integers of varying sizes
       @param nums2 ArrayList of integers of varying sizes
       @param nums3 ArrayList of integers of varying sizes
       @param nums4 ArrayList of integers of varying sizes
       @return an array of the sums of the corresponding elements from each array
   */
public static ArrayList<Integer> arrayOfSums(ArrayList<Integer> nums1, ArrayList<Integer> nums2, ArrayList<Integer> nums3, ArrayList<Integer> nums4 )
{
       ArrayList<Integer> numsSums = new ArrayList<Integer>();
       return numsSums;

}// end arrayOfSums

  
   //Overloaded methods here to compile

       public static ArrayList<Integer> arrayOfSums(ArrayList<Integer> nums1, ArrayList<Integer> nums2, ArrayList<Integer> nums3)
{
           ArrayList<Integer> numsSums = new ArrayList<Integer>();
        return numsSums;

}// end arrayOfSums
       public static ArrayList<Integer> arrayOfSums(ArrayList<Integer> nums1, ArrayList<Integer> nums2)
       {
           ArrayList<Integer> numsSums = new ArrayList<Integer>();
       return numsSums;
       }// end arrayOfSums

Answer 1

public class ArrayListSums {
        public static void main(String[] args) {
                java.util.ArrayList list1 = new java.util.ArrayList();
                list1.add(2);
                list1.add(4);
                list1.add(7);
                
                java.util.ArrayList list2 = new java.util.ArrayList();
                list2.add(3);
                list2.add(7);
                list2.add(14);
                System.out.println(arrayOfSums(list1,list2));
                
        }
        public static java.util.ArrayList<Integer> arrayOfSums(java.util.ArrayList<Integer> nums1,
                        java.util.ArrayList<Integer> nums2, java.util.AbstractList<Integer> nums3,
                        java.util.ArrayList<Integer> nums4) {
                java.util.ArrayList<Integer> numsSums = new java.util.ArrayList<Integer>();
                // iterating through arraylist and getting elemenet from each list and adding to result
                for (int i = 0; i < nums1.size(); i++) {
                        int total=0;
                        //checking if num1 has valid index
                        if(nums1.size()>i)
                                total+=nums1.get(i);
                        //checking if num2 has valid index
                        if(nums2.size()>i)
                                total+=nums2.get(i);
                        //checking if num3 has valid index
                        if(nums3.size()>i)
                                total+=nums3.get(i);
                        //checking if num4 has valid index
                        if(nums4.size()>i)
                                total+=nums4.get(i);
                        
                        numsSums.add(total);
                }
                return numsSums;

        }// end arrayOfSums

        // Overloaded methods here to compile

        public static java.util.ArrayList<Integer> arrayOfSums(java.util.ArrayList<Integer> nums1,
                        java.util.ArrayList<Integer> nums2, java.util.ArrayList<Integer> nums3) {
                java.util.ArrayList<Integer> numsSums = new java.util.ArrayList<Integer>();
                // iterating through arraylist and getting elemenet from each list and adding to result
                for (int i = 0; i < nums1.size(); i++) {
                        int total=0;
                        //checking if num1 has valid index
                        if(nums1.size()>i)
                                total+=nums1.get(i);
                        //checking if num2 has valid index
                        if(nums2.size()>i)
                                total+=nums2.get(i);
                        //checking if num3 has valid index
                        if(nums3.size()>i)
                                total+=nums3.get(i);
                        
                        numsSums.add(total);
                }
                return numsSums;

        }// end arrayOfSums

        public static java.util.ArrayList<Integer> arrayOfSums(java.util.ArrayList<Integer> nums1,
                        java.util.ArrayList<Integer> nums2) {
                java.util.ArrayList<Integer> numsSums = new java.util.ArrayList<Integer>();
                // iterating through arraylist and getting elemenet from each list and adding to result
                for (int i = 0; i < nums1.size(); i++) {
                        int total=0;
                        //checking if num1 has valid index
                        if(nums1.size()>i)
                                total+=nums1.get(i);
                        //checking if num2 has valid index
                        if(nums2.size()>i)
                                total+=nums2.get(i);
                        numsSums.add(total);
                }
                return numsSums;
        }// end arrayOfSums
}

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