根据map key进行排序

 1 package com.kingdee.eas.hr.perf.client;
 2 
 3 import java.util.ArrayList;
 4 import java.util.Collections;
 5 import java.util.Comparator;
 6 import java.util.HashMap;
 7 import java.util.Iterator;
 8 import java.util.List;
 9 import java.util.Map;
10 import java.util.Set;
11 import java.util.TreeSet;
12 
13 //add by ypf on 20140410  根据map的key进行排序
14 public class MapSort {
15 
16     private HashMap map = new HashMap();
17     private Set keySet = map.keySet();
18 
19     public Object get(String key) {
20         return map.get(key);
21     }
22 
23     public void put(String key, Object value) {
24         map.put(key, value);
25     }
26 
27     public Set sort(Map map) {
28         List list = new ArrayList(map.keySet());
29 
30         Collections.sort(list, new Comparator() {
31             public int compare(Object a, Object b) {
32                 return a.toString().toLowerCase().compareTo(
33                         b.toString().toLowerCase());
34             }
35         });
36 
37         this.keySet = new TreeSet(list);
38         return keySet;
39     }
40 
41     public Set keySet() {
42         return this.keySet;
43     }
44 
45     public static void main(String[] args) {
46         MapSort map = new MapSort();
47         map.put("1", "yi");
48         map.put("8", "ba");
49         map.put("9", "jiu");
50         map.put("7", "qi");
51         map.put("5", "wu");
52         map.put("6", "liu");
53         map.put("4", "si");
54         map.put("3", "san");
55         map.put("2", "er");
56 
57         for (Iterator it = map.keySet().iterator(); it.hasNext();) {
58             String key = (String) it.next();
59             // System.out.println( "key[ " + key + "],   value[ " + map.get(key)
60             // + "] ");
61         }
62 
63         // System.out.println( "
 ");
64 //        map.sort();
65         for (Iterator it = map.keySet().iterator(); it.hasNext();) {
66             String key = (String) it.next();
67             System.out.println("key[ " + key + "],   value[ " + map.get(key)
68                     + "] ");
69         }
70     }
71 }