I've run into this while writing a Traveling Salesman program. For an inner loop, I tried a
for(Point x:ArrayList<Point>) {
// modify the iterator
}
but when adding another point to that list resulted in a ConcurrentModicationException
being thrown.
However, when I changed the loop to
for(int x=0; x<ArrayList<Point>.size(); x++) {
// modify the array
}
the loop ran fine without throwing an exception.
Both a for loops, so why does one throw an exception while the other does not?
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