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Android HashMap按照键值排序的两种方法

有如下一个 Map 对象:

HashMap<Integer, String> map = new HashMap<Integer, String>();

map.put(3,"A");

map.put(2,"B");

map.put(1,"C");

键值排序第一种方法:

Object[] key =  map.keySet().toArray();  Arrays.sort(key);  for(int i = 0; i<key.length; i++){       Log.i("sang", "value=http://www.mamicode.com/>"+map.get(key[i]));  }

键值排序第二种方法:

List arrayList = new ArrayList(map.entrySet());Collections.sort(arrayList, new Comparator() {  public int compare(Object arg1, Object arg2)  {    Map.Entry obj1 = (Map.Entry) arg1;    Map.Entry obj2 = (Map.Entry) arg2;    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();   Log.i("sang","value =http://www.mamicode.com/>"+map.get(key));  }

 

Android HashMap按照键值排序的两种方法