Hashtable hashtable = new Hashtable();
        hashtable.put(1, "今天");
        hashtable.put(2, "天气");
        hashtable.put(3, "不怎么好");

        //遍历Key
        Enumeration enumeration = hashtable.keys();
        while (enumeration.hasMoreElements()) {
            System.out.println(enumeration.nextElement());
        }

        //遍历value
        Enumeration enumeration1 = hashtable.elements();
        while (enumeration1.hasMoreElements())
            System.out.println(enumeration1.nextElement());
    }

3
2
1
不怎么好
天气
今天