map中排序实例

Map<String, Integer> map = new TreeMap<String, Integer>(); 

    map.put("j2se", 20); 
    map.put("j2ee", 10); 
    map.put("j2me", 30); 

    List<Map.Entry<String, Integer>> infoIds = new        ArrayList<Map.Entry<String, Integer>>( 
    map.entrySet()); 
//排序前 
for (int i = 0; i < infoIds.size(); i++) { 
String id = infoIds.get(i).toString(); 
System.out.println(id); 
} 
//排序 
Collections.sort(infoIds, new Comparator<Map.Entry<String, Integer>>() { 
public int compare(Map.Entry<String, Integer> o1, 
Map.Entry<String, Integer> o2) { 
return (o2.getValue() - o1.getValue()); 
} 
}); 
//排序后 
for (int i = 0; i < infoIds.size(); i++) { 
String id = infoIds.get(i).toString(); 
System.out.println(id); 
} 
排序前: 
j2ee=10 
j2me=30 
j2se=20 
排序后: 
j2me=30 
j2se=20 
j2ee=10 

 在javaeye上看到的,备用!

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