比stream流更实用的编码

public class Stream {

    public static void main(String[] args) {
        List<String> list1 = Arrays.asList("aa", "bb", "cc", "dd");
        List<String> list2 = Arrays.asList("aa", "cc", "ee", "ff");

        //过滤掉集合1中含有集合2的元素
        // stream流写法
        List<String> filterRes = list1.stream().filter(v -> !list2.contains(v)).collect(Collectors.toList());
        // 集合求差
        list1.removeAll(list2);
    }
}