Computer scienceProgramming languagesJavaWorking with dataMultithreadingThread-safe collections

CopyOnWriteArrayList

Comprehension

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What will we see after running this code?

CopyOnWriteArrayList<Integer> onWriteArrayList = new CopyOnWriteArrayList<>();
onWriteArrayList.add(1);
onWriteArrayList.add(2);
onWriteArrayList.add(3);

Iterator<Integer> iterator = onWriteArrayList.iterator();

while (iterator.hasNext()) {
    System.out.print(iterator.next() + " ");
    iterator.remove();
}

Select one option from the list

Nothing. The code won't compile.

It will print "1 3 "

It will print "1 " and UnsupportedOperationException

It will print "1 2 3 "

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