Command Tugas 6

/**
 * This class holds information about a command that
 * was issued by the user.
 * A command currently consists of two strings: a
 * command word and a second  word (for example, if the command was "take map",
 * then the two strings obviously are "take" and "map").
 *
 * The way this is used is: Commands are already
 * checked for being valid  command words. If the user entered an invalid
 * command (a word that is not known) then the command word is <null>.
 *
 *  If the command had only one word, then the second
 *  word is <null>.
 *
 * @author Muhammad Naufaldillah
 * @version 24 November 2020
 */
public class Command
{
    private String commandWord;
    private String secondWord;

    /**
     * Create a command object. First and second word
     * must be supplied, but either one (or both) can be null. The command
     * word should be null to indicate that this was a command that is not
     * recognised by this game.
     */
    public Command(String firstWord, String secondWord)
    {
        commandWord = firstWord;
        this.secondWord = secondWord;
    }

    /**
     *  Return the command word (the first word) of this
     *  command. If the command was not understood, the result is null.
     */
    public String getCommandWord()
    {
        return commandWord;
    }

    /**
     * Return the second word of this command. Returns
     * null if there was no second word.
     */
    public String getSecondWord()
    {
        return secondWord;
    }

    /**
     * Return true if this command was not understood.
     */
    public boolean isUnknown()
    {
        return (commandWord == null);
    }

    /**
     * Return true if the command has a second word.
     */
    public boolean hasSecondWord()
    {
        return (secondWord != null);
    }
}