How to set view of Keys from Java Hashtable

Problem Description:

How to set view of Keys from Java Hashtable?

Solution:

Following example uses keys() method to get Enumeration of Keys of the Hashtable.

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());
      }
   }
}

Result:

The above code sample will produce the following result.

3
2
1

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