public static void main(String[] args) {
        List<String> list1 = new ArrayList<String>();
        System.out.println("list1.add(Object)...");
        List<String> list2 = new ArrayList<String>();
        System.out.println("list2.add(Object)...");
        if (list1.size() == list2.size()) {
            for (String str1 : list1) {
                for (String str2 : list2) {
                    if (!(str2.equals(str1))) {
                        System.out.println("修改");
                    }
                }
            }
        } else {
            System.out.println("增加删除");
        }
    }