The keySet() method of java.util.Hashtable class will returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa
Signature
public Set<K> keySet()
This method returns a Set view of the keys contained in this map. The set is backed by the map, so changes to the map are reflected in the set, and vice-versa
Example
The following example shows the usage of java.util.Hashtable.keySet() method.
package com.javainterviewpoint; import java.util.Hashtable; import java.util.Set; public class KeySetMethodHashtableExample { public static void main(String args[]) { // create an empty Hashtable Hashtable<Integer,String> hashtable1 = new Hashtable<Integer,String>(); // use put() method to put elements to the Hashtable hashtable1.put(1,"Element1"); hashtable1.put(2,"Element2"); hashtable1.put(3,"Element3"); hashtable1.put(4,"Element4"); hashtable1.put(5,"Element5"); Set<Integer> set = hashtable1.keySet(); System.out.println("**Keyset of \"hashtable1\"**"); for(Integer val : set) { System.out.println(val); } } }
Output
**Keyset of "hashtable1"** 5 4 3 2 1
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