SortKeyMap.java

package study.base.map;
 
import java.util.Comparator;
import java.util.Map;
import java.util.TreeMap;
 
public class SortKeyMap {
    public static void main(String[] args) {
        SortKeyMap sortMap=new SortKeyMap();
        Map
 
   map = new TreeMap
  
   (); map.put("KFC",123456); map.put("WNBA", 4566); map.put("NBA", 333); map.put("CBA", 44444); Map
   
     resultMap = sortMap.sortMapByValue(map); //按Value进行排序 for (Map.Entry
    
      entry : resultMap.entrySet()) { System.out.println(entry.getKey() + " " + entry.getValue()); } } /** * 使用 Map按value进行排序 * @param map * @return */ public Map
     
       sortMapByValue(Map
      
        map) { if (map == null || map.isEmpty()) { return null; } Map
       
         sortMap = new TreeMap
        
         (new MapComparator()); sortMap.putAll(map); return sortMap; } //比较器类 class MapComparator implements Comparator
         
           { public int compare(String me1, String me2) { return me1.compareTo(me2); } } }