How to get all keys of HashTable

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

public class HashTableGetAllKeys {

public static void main(String[] args) {

Hashtable<Integer,String> ht = new Hashtable<Integer,String>();

/*
* Maps the specified key to the specified
* value in this hashtable
*/
ht.put(1, “java”);
ht.put(2, “jersey”);
ht.put(3, “spring”);
ht.put(4, “c”);
ht.put(5, “php”);

/*
* Returns a Set view of the keys contained in this map.
*/
Set<Integer> keys =ht.keySet();

for (Integer key : keys) {
System.out.println(“key =”+key);
}

}

}

Output:

key =5

key =4

key =3

key =2

key =1

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