如何遍历这种类型的Hashtable？

import java.util.Hashtable;
import java.util.Iterator;

public class HashtableTraversal {
    public static void main(String[] args) {
        // 创建Hashtable并添加键值对
        Hashtable<String, String> hashtable = new Hashtable<>();
        hashtable.put("key1", "value1");
        hashtable.put("key2", "value2");
        hashtable.put("key3", "value3");

        // 获取所有键的集合
        Iterator<String> iterator = hashtable.keySet().iterator();

        // 遍历键集合并获取对应的值
        while (iterator.hasNext()) {
            String key = iterator.next();
            String value = hashtable.get(key);
            System.out.println("Key: " + key + ", Value: " + value);
        }
    }
}