Copy Two Dimensional ArrayList as new

Question

So the issue I\'m having is after copying the 2d arraylist, changing the element from one 2d arraylist affects the other 2d arraylist. I want them to be completely separate

Answer 1

You should iterate through the size of the first dimension of the firstTwoDimArray and add new reference of each second dimension to the secondTwoDimArray. i.e.

for(int index = 0; index < firstTwoDimList.size(); index++) {
    secondTwoDimList.add(new ArrayList(firstTwoDimList.get(index)));
}