开发常用

1、两个集合求差集

public static List<String> differenceList(List<String> maxList, List<String> minList) {
        // 大集合用LinkedList
        LinkedList<String> linkedList = new LinkedList<>(maxList);
        // 小集合用HashSet
        HashSet<String> hashSet = new HashSet<>(minList);
        // 采用Iterator迭代器进行遍历
        Iterator<String> iterator = linkedList.iterator();

        while (iterator.hasNext()) {
            if (hashSet.contains(iterator.next())) {
                iterator.remove();
            }
        }
        return new ArrayList<>(linkedList);
    }