java – 将类型的iterator.next()方法返回到Character类

HashMap<Character,Integer> hm = new HashMap<Character,Integer>();

我使用以下方法打印出内容：

Set hmset = hm.entrySet();
Iterator iterator = hmset.iterator();
while(iterator.hasNext())
    {
    Character key = new Character(iterator.next());
    System.out.println("key : "+key+"value : "+(Integer)hm.get(key));
}

我收到以下错误：

error: constructor Character in class Character cannot be applied to given types;

我还尝试了以下类型转换方式：

Character key = (Character)iterator.next();

但那也行不通.任何帮助非常感谢.
谢谢..