jodd-core/src/main/java/jodd/util/collection/CompositeIterator.java
public void add(final Iterator<T> iterator) {
		if (allIterators.contains(iterator)) {
			throw new IllegalArgumentException("Duplicate iterator");
		}
		allIterators.add(iterator);
	}
public void add(final Iterator<T> iterator) {
		if (allIterators.contains(iterator)) {
			throw new IllegalArgumentException("Duplicate iterator");
		}
		allIterators.add(iterator);
	}
Adds an iterator to this composite.