The following code is supposed to fil list3 with every possible sum of elements

Question

The following code is supposed to fil list3 with every possible sum of elements from list1 and list2. So list3 should end up holding

{ 11, 12, 13, 21, 22, 23, 31, 32, 33, 41, 42, 43, 51, 52, 53}

But the code is incorrect. What is wrong? How could you fix it?

List<Integer> list1 = Arrays.asList(10,20, 30, 40, 50);

  List<Integer> list2 = Arrays.asList(1, 2, 3);

  List<Integer> list3 = new ArrayList<Interger>();

for (Iterator<Integer> it1 = list1.iterator(); it1.hasNext(); )  

for (Iterator<Integer> it2 = list2.iterator(); it2.hasNext(); )

{

int n = it1.next();

int m = it2.next();

list3.add( n + m );

}

for (int i : list3)

System.out.print(i + " ");

System.out.println();

Explanation / Answer

//Import packages
import java.util.ArrayList;
import java.util.List;
//Begin class
public class Test {

    public static void main(String[] args) {                   //begin main method

//Array list declarations
List<Integer> list1 = new ArrayList<Integer>();
List<Integer> list2 = new ArrayList<Integer>();
List<Integer> list3 = new ArrayList<Integer>();
//adding list elements
list1.add(10);
list1.add(20);
list1.add(30);
list1.add(40);
list1.add(50);
list2.add(1);
list2.add(2);
list2.add(3);
//loop to find summation and add to list3
for (int i = 0; i < list1.size(); i++)
{
   for (int j = 0; j < list2.size(); j++)
    {
      
        list3.add(list1.get(i) + list2.get(j));
   }
}

//list2 elements display after performing sum task
for (int i : list3)

    System.out.print(i + " ");

System.out.println();
}
}

Output : 11 12 13 21 22 23 31 32 33 41 42 43 51 52 53

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