Question

I want to compare two different types of array list i.e.

ArrayList<A> list1 = new ArrayList<A>();
ArrayList<B> list2 = new ArrayList<B>();

So I want to compare list1 and list2 and get the count of indexes at which both are same?

Answer 1

So I want to compare list1 and list2 and get the count of indexes at which both are same?

(I have no idea what types you have for A and B, but I’ll just assume that it makes sense to compare them using equals.)

You can use Iterators to iterate over the lists, and use an if-statement to increment a counter for each element that equal.

Iterator<A> iter1 = list1.iterator();
Iterator<B> iter2 = list2.iterator();

int sameCounter = 0;

while (iter1.hasNext() && iter2.hasNext())
    if (iter1.next().equals(iter2.next()))
        sameCounter++;