HashMap 按key排序

 

HashMap   map   =   new   HashMap();  
map.put("0201",   "0201");  
map.put("01",   "01");  
map.put("0304",   "0304");  
map.put("0101",   "0101");  

Object[]   key   =     map.keySet().toArray();  
Arrays.sort(key);  

for   (int   i   =   0;   i   <   key.length;   i++)   {  
       System.out.println(map.get(key[i]));  
}  

 

Map hashMap = new HashMap();

List arrayList = new ArrayList(hashMap.entrySet());

Collections.sort(arrayList, new Comparator() {
   public int compare(Object o1, Object o2) {
    Map.Entry obj1 = (Map.Entry) o1;
    Map.Entry obj2 = (Map.Entry) o2;
    return (obj1.getKey()).toString().compareTo(obj2.getKey());
   }
  });
//  将 HASHMAP中的数据排序-------------------------------------------
  for (Iterator iter = arrayList.iterator(); iter.hasNext();) {
   Map.Entry entry = (Map.Entry) iter.next();
   String     key = (String)entry.getKey();
   ..........
  }