Initial

src/com/bayviewglen/zork/CommandWords.java

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+package com.bayviewglen.zork;
+
+/*
+ * Author:  Michael Kolling.
+ * Version: 1.0
+ * Date:    July 1999
+ * 
+ * This class holds an enumeration of all command words known to the game.
+ * It is used to recognise commands as they are typed in.
+ *
+ * This class is part of the "Zork" game.
+ */
+class CommandWords {
+	// a constant array that holds all valid command words
+	private static final String validCommands[] = { "go", "quit", "help", "eat" };
+
+	/**
+	 * 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) {
+		for (int i = 0; i < validCommands.length; i++) {
+			if (validCommands[i].equals(aString))
+				return true;
+		}
+		// if we get here, the string was not found in the commands
+		return false;
+	}
+
+	/*
+	 * Print all valid commands to System.out.
+	 */
+	public void showAll() {
+		for (int i = 0; i < validCommands.length; i++) {
+			System.out.print(validCommands[i] + "  ");
+		}
+		System.out.println();
+	}
+}