Question

I want to do something like this:

int[][] A = ... // initialize matrix
List<Integer> rows = new LinkedList<Integer>();
for (int r = 0; r < 1000000; r++) rows.add(r);
Iterator<Integer> iter = rows.iterator();
for ( ; iter.hasNext(); ) {
    // some condition based on which I remove an element
    if (200 != A[iter.next().intValue()][0]) iter.remove();
}
if (rows.isEmpty()) {
    System.out.println("empty");
}

But it does not work.

Answer 1

More than likely you are getting an ArrayIndexOutOfBoundsException. This is because the value A[iter.next().intValue()] has exceeded the row bounds set in your initialize matrix section.

Assuming you do have rows, you could use:

for (int r = 0; r < A[0].length; r++) {
...