List<String> listA = new ArrayList<String>();
List<String> listB = new ArrayList<String>();
for(int i = 0;i < listB.size();i++){
	Iterator<String> iterator = listA.iterator();
	while(iterator.hasNext()){
		String next = iterator.next();
		if(next == listB.get(i)){
			iterator.remove();
		}
	}
}