Java Collection Tutorial - Java Hashtable.keySet()


Hashtable.keySet() has the following syntax.

public Set <K> keySet()


In the following code shows how to use Hashtable.keySet() method.

/*from   w  w  w  .  j a  v a  2  s.  c  om*/

import java.util.Hashtable;
import java.util.Set;

public class Main {
   public static void main(String args[]) {
      // create hash table 
      Hashtable<Integer,String> htable1 = new Hashtable<Integer,String>();      
      // put values in table
      htable1.put(1, "A");
      htable1.put(2, "B");
      htable1.put(3, "C");
      htable1.put(4, "from");
      // create a set view
      Set st=htable1.keySet();
      System.out.println("Display result: "+st); 

The code above generates the following result.