Difference between HashTable and HashMap in Java

Following are the notable differences between HashTable and HashMap classes in Java.

Example

import java.util.HashMap;
import java.util.Hashtable;
import java.util.Map;

public class Tester {
   public static void main(String args[]) {

      Map<String, String> map = new HashMap<String, String>();

      map.put("1", "One");
      map.put("2", "Two");
      map.put("3", "Three");
      map.put("5", "Five");
      map.put("6", "Six");

      System.out.println("HashMap: " + map);

      Map<String, String> map1 = new Hashtable<String, String>();
   
      map1.put("1", "One");
      map1.put("2", "Two");
      map1.put("3", "Three");
      map1.put("5", "Five");
      map1.put("6", "Six");

      System.out.println("HashTable: " + map1);
   }
}

Output

HashMap: {1 = One, 2 = Two, 3 = Three, 5 = Five, 6 = Six}
HashTable: {6 = Six, 5 = Five, 3 = Three, 2 = Two, 1 = One}