java 判断一个List是否是另一个List的子集

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/** 判断List2是否属于list1的子集  * @param list1  * @param list2  * @return  */ public static <E> boolean isSubList(List<E> parent, List<E> children) {     List<E> parent_1 = new ArrayList<>();     parent_1.addAll(parent);     List<E> children_1 = new ArrayList<>();     children_1.addAll(children);     int differ = parent_1.size() - children_1.size();     parent_1.removeAll(children_1);     if (differ > 0 && differ == parent_1.size()) {         return true;     } else {         return false;     } }