java.util.Hashtable.keys() Method

Description

The keys() method is used to get an enumeration of the keys in this hashtable.

Declaration

Following is the declaration for java.util.Hashtable.keys() method.

public Enumeration<K> keys()

Parameters

• NA

Return Value

The method call returns an enumeration of the keys in this hashtable.

Exception

• NA

Example

The following example shows the usage of java.util.Hashtable.keys()

package com.tutorialspoint;

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());
      }
   }    
}

Let us compile and run the above program, this will produce the following result.

Display result:
4
3
2
1