Java Example - Traverse the key values ​​of HashTable

The following example demonstrates how to use the keys() method of the Hashtable class to traverse the output key values:

/*
 author by w3cschool.cc
 Main.java
 */

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());
      }
   }
}

The output result of running the above code is:

3
2
1

above It is a Java example - traversing the key value content of HashTable. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!