import java.util.HashMap;

public class HashMap1 {
  public static void main(String[] args) {
    HashMap<String, String> capitalCities = new HashMap<String, String>();
    // Kan også være f.eks. <String, Integer>

    // Legge til nøkler og verdier (Land, By)
    capitalCities.put("England", "London"); // {"England": "London"}
    capitalCities.put("Germany", "Berlin");
    capitalCities.put("Norway", "Oslo");
    capitalCities.put("USA", "Washington DC");
    System.out.println(capitalCities);
    System.out.println(capitalCities.get("Norway")); // "Oslo"
    System.out.println(capitalCities.containsKey("Sweden")); // "false"

    // Print keys
    for (String i : capitalCities.keySet()) {
      System.out.println(i);
    }

    // Print values
    for (String i : capitalCities.values()) {
      System.out.println(i);
    }

    capitalCities.put("USA", "New York");
    System.out.println(capitalCities.get("USA")); // "New York"

    // Print keys and values
    // 'key: *KEY* value: *VALUE*'
    for (String i : capitalCities.keySet()) {
      System.out.println("key: " + i + " value: " + capitalCities.get(i));
    }
  }
}