public class Critter
{
    public static final char REGULAR = '*';
    public static final char EMPTY = ' ';
    public static final char FERTILE = '!';


    private char appearance;

    public Critter ()
    {
        appearance = REGULAR;
    }

    public Critter (char ch)
    {
        appearance = ch;
    }

    public char getAppearance ()
    {
        return(appearance);
    } 

    public void setAppearance (char newAppearance)
    {
        if ((newAppearance == EMPTY) || 
            (newAppearance == REGULAR) ||
            (newAppearance == FERTILE))
            appearance = newAppearance;
         else
             System.out.println("Critter's appearance must be either a star, space or exclaimation");
    } 

    public void display ()
    {
        System.out.print(appearance);
    }
}