打印霍夫曼频率表

我正在做一些霍夫曼编码，我希望能够打印频率表。

然而，我尝试了下面的代码，得到了一个‘不兼容的类型:条目不能被转换为(Map.Entry Entry :freq.entrySet())的条目’错误。有没有办法修复它，我可能能够显示频率表，它将更多地以表或类似数组的形式，而不是地图形式？

public static void buildHuffmanTree(String text)
{   // count frequency each character and store it in a map
    Map<Character, Integer> freq = new HashMap<>();
    for (int i = 0 ; i < text.length(); i++)
    {
        if (!freq.containsKey(text.charAt(i)))
        {
            freq.put(text.charAt(i), 0);
        }
        freq.put(text.charAt(i), freq.get(text.charAt(i)) + 1);
    }

    // Create a priority queue to store nodes of Huffman tree
    // Notice that highest priority item has lowest frequency
    PriorityQueue<Node> pq = new PriorityQueue<>((l, r) -> l.freq - 
    r.freq);

    for (Map.Entry<Character, String> entry : freq.entrySet())
    {
        System.out.println(entry.getKey() + " " + entry.getValue());
    }
}

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