I have a method which iterates through a list and removes an object.
public void iterateAndRemove(List<String> l) {
for (String s : l) {
l.remove(s); //should throw exception
}
}
Ideally, this should throw an exception as I am not using Iterator.
But it just works fine. Is my understanding wrong?
Widely known concept is that removing through Iterator is a fail-safe meachnism.
But for-each loop can be used to remove an item from a list because javac internally generates code that uses Iterator, repeatedly calling hasNext and next methods.
Further, even if for-each was to throw concurrent modification exception, it is not necessary that a program will always throw the exception, so you must not rely on a few test runs.
But you must note that this is true for single threaded enviornment. For multi-threaded enviornment you will have to take lock on an object for your program to not throw an exception.
