set集合的排序

Set<DiaryPicture> diaryPictureSet = growthDiary.getDiaryPictures();
List<DiaryPicture> diaryPictureList = new ArrayList<DiaryPicture>(diaryPictureSet);

/*将list有序排列*/
Collections.sort(diaryPictureList, new Comparator<DiaryPicture>() {
public int compare(DiaryPicture arg0, DiaryPicture arg1) {
return arg0.getId().compareTo(arg1.getId()); // 按照id排列
}
});