Iterate through an ArrayList of ArrayLists in Java

Question

I have the following ArrayList...

ArrayList<ArrayList<Integer>> row1 = new ArrayList<ArrayList<Integer>>();

The following arraylists are added to it....

row1.add(cell1);
row1.add(cell2);
row1.add(cell3);
row1.add(cell4);
row1.add(totalStockCell);

I want to iterate through the arraylist row1 and print the contents.

Would a loop within a loop work here?

E.g.

while(it.hasNext()) {

//loop on entire list of arraylists
    while(it2.hasNext) {
      //each cell print values in list

          } }

Answer 1

This is the canonical way you do it:

for(List<Integer> innerList : row1) {
    for(Integer number : innerList) {
        System.out.println(number);
    }
}

Answer 2

for (ArrayList<Integer> list : row1)
{
    for (Integer num : list)
    {
        //doSomething
    }
}

Java enhanced-for loops use an iterator behind the scenes.