001    package breakout;
002    
003    /** Defines the contract for objects that act as Walls in the game.
004    **/
005    public interface Wall extends BreakoutComponent {
006        /** Tells if this wall kills things that hit it. 
007          * @return <code>true</code> if the things that hit it should die; <code>false</code> if 
008          *  things that hit it are otherwise unaffected.
009        **/
010        public boolean killing();
011    }