对Map进行按值（value）排序

/** * @param h * @return * 实现对map按照value升序排序 */ @SuppressWarnings("unchecked") public static Map.Entry[] getSortedHashtableByValue(Map h) { Set set = h.entrySet(); Map.Entry[] entries = (Map.Entry[]) set.toArray(new Map.Entry[set .size()]); Arrays.sort(entries, new Comparator() { public int compare(Object arg0, Object arg1) { Long key1 = Long.valueOf(((Map.Entry) arg0).getValue().toString()); Long key2 = Long.valueOf(((Map.Entry) arg1).getValue().toString()); return key1.compareTo(key2); } }); return entries; }