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suppose you have a HashMap m
and there is already a key value pair <"key1", object> inside.
can you do the following?
m.put("newkey", m.remove("key1"))
will you get a ConcurrentModificationException?
You can do that as long as it’s not in the body of a loop that is iterating over the hashMap entries. The way that will work is that the remove operation will execute and complete before the put operation so it’s semantically equivalent to doing it in 2 lines.