liuyb94242的专栏

<br />1) 并集<br />public List<String> removeDuplicate(List<String> list1, List<String> list2) <br /> {   <br />  List<String> list = new ArrayList<String>();<br />  list.addAll(list1);<br />  list.addAll(list2);<br />  HashSet<String> hs = new HashSet<Strin