JAVA_collection_集合相關知識點（二、獲取集合對象中某個屬性的集合——CollectionUtils.collect（）方法）

• List<User> userList = new ArrayList<User>();
• List<String> userNameList = (List<String>) CollectionUtils.collect(userList, new Transformer() {
• @Override
• public Object transform(Object o) {
• User user = (User) o;
• return user.getName();
• }
• });

 

 

1. List<Integer> list= (List<Integer>)CollectionUtils.collect(Arrays.asList(newsIds.split(",")),
2. new Transformer<String>() {
3. @Override
4. public Integer transform(String s) {
5. return Integer.parseInt(s);
6. }
7. });