java.util.ConcurrentModificationException not thrown when expected

Question

The following code throws a java.util.ConcurrentModificationException, as expected:

   public void test(){
      ArrayList myList = new ArrayLi         


        

Answer 1

Note also the last paragraph of the ArrayList documentation summary:

Fail-fast iterators throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.

If you're worrying about forcing lists to be read-only, use the Collections.unmodifiableList method, instead of checking for ConcurrentModificationException, which as mentioned above is not guaranteed to be thrown in all relevant cases.