CommandWords.java

/*
 * This class holds an enumeration of all command words known to the game.
 * It is used to recognise commands as they are typed in.
 *
 */

class CommandWords
{
    // a constant array that holds all valid command words
    private final String validCommands = 
        "go quit help pick back look purse drop eat climb smash listen inspect conch scrape";
        


    /**
     * Constructor - initialise the command words.
     */
    public CommandWords()
    {
        // nothing to do at the moment... :(
    }

    /**
     * Check whether a given String is a valid command word. 
     * Return true if it is, false if it isn't.
     **/
    public boolean isCommand(String aString)
    {
        return validCommands.indexOf(aString) >= 0;
    }

    /**
     * Print all valid commands to System.out.
     */
    public void showAll() 
    {
        System.out.println(validCommands);
    }
}