Question

I want to remove an item from HashMap, by applying a criteria. Consider this code:

Set<Foo> set = myMap.keySet();
Iterator<Foo> itr = set.iterator();
while (itr.hasNext())
{
    Foo foo = itr.next();
    if (foo.toString().length() < 3) {
        myMap.remove(foo); //remove the pair if key length is less than 3
    }
}

So I get a ConcurentModificationException because during the iteration I am modifying the HashMap. What should I do? Is there any other way to search for my criteria and execute the remove command at the end so that I can avoid this exception?

Answer 1

Use itr.remove() instead of myMap.remove(o.toString())