Java Collection Tutorial - Java Hashtable.keys()


Hashtable.keys() has the following syntax.

public Enumeration <K> keys()


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

//w w  w. j av a2s .c o  m

import java.util.Enumeration;
import java.util.Hashtable;

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 enumeration for keys
      Enumeration en=htable1.keys();
      System.out.println("Display result:"); 
      // display search result
      while (en.hasMoreElements()) {

The code above generates the following result.