java.util.Hashtable.keySet() Method

Description

The keySet() method is used to get a Set view of the keys contained in this Hashtable.

Declaration

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

public Set<K> keySet()

Parameters

• NA

Return Value

The method call returns a set view of the keys contained in this map.

Exception

• NA

Example

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

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 a set view
      Set st=htable1.keySet();
      
      System.out.println("Display result: "+st); 
   }    
}

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

Display result: [4, 3, 2, 1]