JAVA Hashtable找到最大值

import java.util.Hashtable;
import java.util.Enumeration;

public class Main {
    public static void main(String[] args) {
        Hashtable<String, Integer> hashtable = new Hashtable<>();
        hashtable.put("A", 10);
        hashtable.put("B", 20);
        hashtable.put("C", 30);
        hashtable.put("D", 40);

        int maxValue = Integer.MIN_VALUE;
        String maxKey = "";

        Enumeration<Integer> values = hashtable.elements();
        while (values.hasMoreElements()) {
            int value = values.nextElement();
            if (value > maxValue) {
                maxValue = value;
                maxKey = getKeyFromValue(hashtable, value);
            }
        }

        System.out.println("最大值为：" + maxValue);
        System.out.println("对应的键为：" + maxKey);
    }

    private static <K, V> K getKeyFromValue(Hashtable<K, V> hashtable, V value) {
        for (K key : hashtable.keySet()) {
            if (hashtable.get(key).equals(value)) {
                return key;
            }
        }
        return null;
    }
}