Re: Smuggling information to enums

Jason Cavett <>
Tue, 24 Mar 2009 08:13:51 -0700 (PDT)
On Mar 24, 10:57 am, Roedy Green <>

What the techniques are there for smuggling information to enums?

they don't have constructors. It is not clear how you would make
them nested classes.

Is it possible to somehow have two enum class objects in RAM at once,
each with different instance data?

Do you have to pass it in each time with the method or use static
Roedy Green Canadian Mind Products

"Nature provides a free lunch, but only if we control our appetites."
~ William Ruckelshaus, America's first head of the EPA

I'm not sure what you mean by "smuggling" information.

Enums can have constructors, though. See the following example (this
enum is inside the class ActionManager):

public enum DefaultActions {
    CASCADE_WINDOW_ACTION(new CascadeWindowsAction()),
    CLOSE_ALL_PROJECTS_ACTION(new CloseAllProjectsAction()),
    CLOSE_ALL_WINDOWS_ACTION(new CloseAllWindowsAction());
        // There are more actions, I'm just truncating it for posting

     * Constructor
     * @param action
     * the action to place into the manager
    private DefaultActions(AbstractAction action) {
        String key = this.toString();
        ActionManager.put(key, action);

     * Convenience method for retrieving a default action.
     * @return the action
    public AbstractAction getAction() {
        return ActionManager.get(this.toString());

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