ConcurrentModificationException (yes, I'm using an iterator)

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I haven't submitted the task for validation yet because I already know by test-running it that it won't work. Also I used family members DOB for all the dates so I kinda don't want to post that here. Also I can't post using the code tag because the HashMap uses symbols that get treated as BB code. So here is a screenshot of current removeAllSummerPeople:

I'm getting a ConcurrentModificationException. I know what that is, but I also thought using an iterator was supposed to get around that problem.

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Gellert Varga

Level 23 , Szekesfehervar, Hungary

13 July 2021, 22:05

solution

Use only the itr object to delete an item. You are also using the itr object to get the next item, so try to use itr also to delete an item. The itr object will be able to handle the situation. If you delete directly from the map, it will interfere with the working of itr object, --> Exception.

map.remove(pair.getKey()) // wrong
itr.remove() // correct

Justin Smith

Level 41 , Greenfield, USA, United States

13 July 2021, 22:36

Thank you. That worked.