import java.util.HashMap;
public class Main { public static void main(String[] args) { HashMap<String, String> capitalCities = new HashMap<String, String>();
capitalCities.put("England", "London"); capitalCities.put("Germany", "Berlin"); capitalCities.put("China", "Beijing"); capitalCities.put("USA", "Washington DC");
capitalCities.merge("Canada", "Ottawa", (a, b) -> a + " -> " + b); capitalCities.merge("England", "London", (a, b) -> a + " -> " + b); capitalCities.merge("Germany", "Berlin", (a, b) -> a + " -> " + b);
System.out.println(capitalCities);
}
}