Hashtable(Map <? extends K ,? extends V > t) constructor from Hashtable has the following syntax.
public Hashtable(Map <? extends K ,? extends V> t)
In the following code shows how to use Hashtable.Hashtable(Map <? extends K ,? extends V > t) constructor.
/*w ww. j a v a 2s. c o m*/ import java.util.Hashtable; public class Main { public static void main(String args[]) { Hashtable<Integer, String> htable = new Hashtable<Integer, String>(); // put values into the table htable.put(1, "A"); htable.put(2, "B"); htable.put(3, "C"); htable.put(4, "from java2s.com"); Hashtable<Integer, String> htable1 = new Hashtable<Integer, String>(htable); } }