用keys()方法来遍历HashTable并输出键值

完整代码

import java.util.Enumeration;
import java.util.Hashtable;public class Main {public static void main(String[] args) {Hashtable ht = new Hashtable();ht.put("1", "One");ht.put("2", "Two");ht.put("3", "Three");Enumeration e = ht.keys();while (e.hasMoreElements()){System.out.println(e.nextElement());}}
}

结果输出

3
2
1