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