寻找出现一次的字符

/**
  * 【剑指offer】数组中只出现一次字符
  *
  * @param nums
  */
 private static void getSingleN(String nums) {
     char[] chars = nums.toCharArray();

     HashMap<Object, Integer> map = new HashMap<>();
     for (char aChar : chars) {
         if (map.containsKey(aChar)) {
             Integer integer = map.get(aChar);
             integer++;
             map.put(aChar, integer);
         }else {
             map.put(aChar, 1);
         }
     }
     System.out.println(map);


     for (Map.Entry<Object, Integer> entry : map.entrySet()) {
         if (entry.getValue()==1) {
             System.out.println("只出现一次的字符有："+entry.getKey());
         }
     }

 }