package cn.php;import java.util.ArrayList;import java.util.Arrays;import java.util.Collections;import java.util.Comparator;import java.util.HashMap;import java.util.HashSet;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;import java.util.Set;public class CountList {	public static void main(String[] args) {		List
     
       strs = Arrays.asList("a", "b", "c", "d", "e", "a", "a",				"a", "a", "b", "b", "b");		Map
      
        map = new HashMap
       
        ();		Set
        
          set = new HashSet
         
          (strs);		for (String str : set) {			for (String lstr : strs) {				if (str.equals(lstr)) {					if (map.containsKey(str)) {						Integer count = map.get(str);						count++;						map.put(str, count);					} else {						map.put(str, 1);					}				}			}		}		//printMap(map);		Map
          
            sortMap = sortMapByValue(map); printMap(sortMap); } private static Map
           
             sortMapByValue(Map
            
              map) { List
             
              
               > mapList = new ArrayList
               
                
                 >( map.entrySet()); Collections.sort(mapList, new Comparator
                 
                  
                   >() { @Override public int compare(Entry
                   
                     o1, Entry
                    
                      o2) { return o1.getValue()-o2.getValue(); } }); Map
                     
                       result = new LinkedHashMap
                      
                       (); for(Map.Entry
                       
                         entry:mapList){ result.put(entry.getKey(), entry.getValue()); } return result; } public static void printMap(Map
                        
                          map) { for (Map.Entry
                         
                           entry : map.entrySet()) { System.out.println("Key : " + entry.getKey() + " Value : " + entry.getValue()); } }}
                         
                        
                       
                      
                     
                    
                   
                  
                 
                
               
              
             
            
           
          
         
        
       
      
     

public Map
      
        sortMapByKey(Map
       
         oriMap) {		if (oriMap == null || oriMap.isEmpty()) {			return null;		}		Map
        
          sortedMap = new TreeMap
         
          (				new Comparator
          
           () {					public int compare(String key1, String key2) {						int intKey1 = 0, intKey2 = 0;						try {							intKey1 = getInt(key1);							intKey2 = getInt(key2);						} catch (Exception e) {							intKey1 = 0;							intKey2 = 0;						}						return intKey1 - intKey2;					}				});		sortedMap.putAll(oriMap);		return sortedMap;	}	private int getInt(String str) {		int i = 0;		try {			Pattern p = Pattern.compile("^\\d+");			Matcher m = p.matcher(str);			if (m.find()) {				i = Integer.valueOf(m.group());			}		} catch (NumberFormatException e) {			e.printStackTrace();		}		return i;	}