HashMaps inside the interface

Have you ever needed to have HashMap as constant values in the interface, but couldn't do because you do not know how to do it. Here are the two ways I got.

First: Define class that returns unmodifiable map.

class ConstMaps
{
  static Map maps = new HashMap();
  static
  {
      maps.put("mobile", getMobileMap());
      maps.put("car", getCarMap());
  }
  private static Map getMobileMap()
  {
      Map hm = new HashMap();
      hm.put("NOKIA", "Nokia 6121 Classic");
      hm.put("SONY", "Sony Ericsson TM506");
      hm.put("MOTOROLA", "Motorola Aura");
      hm.put("IPHONE", "Apple iPhone 3G");
      return hm;
  }
  private static Map getCarMap()
  {
      Map hm = new HashMap();
      hm.put("FORD", "Ford Capri");
      hm.put("VOLKSWAGEN", "VW Scirocco");
      hm.put("TOYOTA", "Toyota SpaceCruiser");
      hm.put("BMW", "BMW 116i");
      hm.put("VAUXHALL", "Vauxhall Frontera");
      return hm;
  }
  public static Map getMap(String mapName)
  {
      return Collections.unmodifiableMap(maps.get(mapName.toLowerCase()));
  }
}


public interface Const_1
{
  float LEASTPRICE = 1000;
  float MAXPRICE = 100000;

  Map MOBILEMAP = MyMapGetter.getMap("mobile");
  Map CARMAP = MyMapGetter.getMap("car");
}

Second: Define it using anonymous classes and initializer as shown below.
With this syntax, an anonymous extends the HashMap and uses 'put' in the initialization block.

public interface Const_2
{
  float LEASTPRICE = 1000;
  float MAXPRICEZ = 100000;
  
  Map MOBILEMAP  = new HashMap()
  {
    {
      put("NOKIA", "Nokia 6121 Classic");
      put("SONY", "Sony Ericsson TM506");
      put("MOTOROLA", "Motorola Aura");
      put("IPHONE", "Apple iPhone 3G");
    }
  };

  Map CARMAP = new HashMap()
  {
    {
      put("FORD", "Ford Capri");
      put("VOLKSWAGEN", "VW Scirocco");
      put("TOYOTA", "Toyota SpaceCruiser");
      put("BMW", "BMW 116i");
      put("VAUXHALL", "Vauxhall Frontera");
    }
  };                                                     
}

I hope this is useful.

Kovil Pillai P.