java中字符出现的次数

import java.util.*;public class Test { public static void main(String args[]){ String s = "abcdad"; //待测试的字符串 Map<Character, Integer> result = getCharMaps(s); System.out.println(result);//打印出字符串中各字符出现的次数！ } public static Map<Character, Integer> getCharMaps(String s) { Map<Character, Integer> map = new HashMap<Character, Integer>(); for(int i = 0; i < s.length(); i ) { Character c = s.charAt(i); Integer count = map.get(c); map.put(c, count == null ? 1 : count 1); } return map; }}