001    package sale;
002    
003    /**
004     * Exception thrown by all methods in {@link NullDisplay} to indicate that this is not a valid
005     * display.
006     *
007     * @author Steffen Zschaler
008     * @version 2.0 27/05/1999
009     * @since v2.0
010     */
011    public class InvalidDisplayException extends RuntimeException {
012    
013        /**
014         * Create a new InvalidDisplayException.
015         */
016        public InvalidDisplayException() {
017            super();
018        }
019    
020    }