Java 多个集合求交集

多个集合求交集，使用了apache.commons包的CollectionUtils.intersection()方法

  public static void main(String[] args) {
    
    
        //Lists.newArrayList 来自 google的guava
        List<String> list1 = Lists.newArrayList("北京", "上海", "深圳", "广州");
        List<String> list2 = Lists.newArrayList("北京", "长沙", "南京", "杭州");
        List<String> list3 = Lists.newArrayList("北京", "长沙", "深圳", "杭州");
        List<List<String>> lists = Lists.newArrayList(list1,list2,list3);
        List<String> result = Lists.newArrayList();
        for (int i = 0; i < lists.size(); i++) {
    
    
            if (i == 0) {
    
    
                //第一次和自己取交集 CollectionUtils 来自 apache.commons
                result = (List<String>) CollectionUtils.
                        intersection(lists.get(0), lists.get(0));
            } else {
    
    
                result = (List<String>) CollectionUtils.
                        intersection(result, lists.get(i));
            }
        }
        System.out.println(result);
    }

输出：