Java Hashtable.putAll(Map <? extends K ,? extends V > t)

public void putAll(Map <? extends K ,? extends V> t)

/*from  w  w  w  .  j  ava 2  s  .c  om*/
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

public class Main {
   public static void main(String args[]) {
      // create hash table 
      Hashtable htable1 = new Hashtable(); 
      
      // create Map
      Map<String,String> map=new HashMap<String,String>();
      
      // put values in map
      map.put("1","tutorial");
      map.put("2","from");
      map.put("3","java2s.com");
          
      System.out.println("Initial hash table value: "+htable1);
      System.out.println("Map values: "+map);
      
      // put map values in table
      htable1.putAll(map);
      System.out.println("Hash table value after put all: "+htable1);
   }    
}