对字符串每个字符个数的统计，并按照个数排序

class NumberCount({
public static void main(String[] args) {
numberCount();
}
private static void numberCount() {
// TODO Auto-generated method stub
String str = "lakjsdlkgjljljlasf我们，他们，，，。。。。";
char[] arr = str.toCharArray();
Map<Character,Integer> map = new TreeMap<Character,Integer>();
for (int i = 0; i < arr.length; i++) {
Integer value = map.get(arr[i]);
if(value != null ){
value = value + 1;
map.put(arr[i], value);
}else{
map.put(arr[i], 1);
}
}
System.out.println(map);
List<Map.Entry<Character,Integer>> mapList = new ArrayList<Entry<Character, Integer>>(map.entrySet());
Collections.sort(mapList,new Comparator<Map.Entry<Character,Integer>>(){
@Override
public int compare(Map.Entry<Character, Integer> e1,
Map.Entry<Character, Integer> e2) {
// TODO Auto-generated method stub
return e1.getValue().compareTo(e2.getValue());
}
});
System.out.println(mapList);
for (Entry<Character, Integer> entry : mapList) {
System.out.print(entry.getKey()+"("+entry.getValue()+ ")" +" ");
}
}
}

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