How can I modify a set while iterating over it in Java?

How can I modify a set while iterating over it in Java?

In Java, modifying a set while iterating can lead to a ConcurrentModificationException. You can avoid this by using an Iterator.

Can you show me an example of using an Iterator?

Sure! Here's a simple example:

Set<String> mySet = new HashSet<>(Arrays.asList("A", "B", "C"));
Iterator<String> iterator = mySet.iterator();
while (iterator.hasNext()) {
    String element = iterator.next();
    if (element.equals("B")) {
        iterator.remove(); // Safely remove element
    }
}

This will remove "B" from the set without throwing an exception.

What if I want to add elements while iterating?

If you need to add elements while iterating, consider collecting the elements to add in a separate collection and then adding them after the iteration.