list 去重并保持原来排序

Posted 2021-01-07 jjsmileeveryday

public  <T> List<T> removeDuplicateKeepOrder(List<T> list){
    Set set = new HashSet();
    List<T> newList = new ArrayList<T>();
    for (T element : list) {
        if (set.add(element)) newList.add(element);
    }
    list.clear();
    list.addAll(newList);
    return list;
}