java 判斷一個List是否是另一個List的子集

	/** 判斷List2是否屬於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;
		}
	}