删除ArrayList中重复元素，并保持顺序

    /**
     * 删除ArrayList中重复元素，并保持顺序
     * @param list
     * @return
     */
 private List<JobInfo> removeDuplicate(List<JobInfo> list) {
        Set<JobInfo> set = new HashSet<JobInfo>();
        List<JobInfo> newList = new ArrayList<JobInfo>();
         for (Iterator<JobInfo> iter = list.iterator(); iter.hasNext();) {
          JobInfo element = (JobInfo) iter.next();
             if (set.add(element))
                newList.add(element);
        }
        return newList;
    }