Code example for ConcurrentModificationException

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            return valid;
        } 
 
        public E next() { 
            if (modCount != expectedModCount) {
                throw new ConcurrentModificationException();
            } 
 
            int i = index;
            if (i >= size) {
                throw new NoSuchElementException();
            } 
 
            if (i >= data.length) {
                throw new ConcurrentModificationException();
            } 
 
            index = i + 1;
            return (E) data[lastRet = i];
        } 
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