Re: Initializing a Map in an Interface?

Kevin McMurtrie <>
Tue, 16 Mar 2010 08:58:34 -0700
In article <>,
 Ian Smith <> wrote:

Isn't this sort of thing that Enums and EnumMaps are meant for? Just
asking . . .


Consider a situation where the design starts out using Enum but later
needs to load definitions from a configuration file. That can't be done
with Enum, EnumMap, or code that works with them. The original poster
mentioned having large sets of definitions of Colors so I think a design
using Enum would run into future problems.

If Enums were to be used for declaration of data that may later become
dynamic, I'd transfer them to a Map that had keys and values that aren't
Enums. Unfortunately the code isn't so clean now. Two classes must be
defined and they're both public.

import java.awt.Color;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public interface FooColor
  enum NamedColorSet
    Black (new Color(0, 0, 0)),
    Obscure_Gray (new Color(51, 51, 51)),
    Dark_Gray (new Color(102, 102, 102)),
    Light_Gray (new Color(153, 153, 153)),
    Pale_Gray (new Color(204, 204, 204)),
    White (new Color(255, 255, 255));
    public final Color color;
    NamedColorSet (Color c)
      color= c;
  public static final Map<String, Color> EIGHT_BIT_COLORS =
    Collections.unmodifiableMap(new HashMap<String, Color>()
      for (NamedColorSet n : NamedColorSet.values())
        put (, n.color);
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