java.util.Hashtable.keys() 方法

package com.codingdict;

import java.util.*;

public class HashTableDemo {
   public static void main(String args[]) {

      // create hash table
      Hashtable htable1 = new Hashtable();      

      // put values in table
      htable1.put(1, "A");
      htable1.put(2, "B");
      htable1.put(3, "C");
      htable1.put(4, "D");

      // create enumeration for keys
      Enumeration en = htable1.keys();

      System.out.println("Display result:");

      // display search result
      while (en.hasMoreElements()) {
         System.out.println(en.nextElement());
      }
   }    
}