综合案例3

.........\explosion.au
.........\Explosion.class

.........\Launcher.class
.........\missile.au
.........\Missile.class
.........\missile.gif
.........\Piece.class
.........\play.htm
.........\readme.txt
.........\rocket.au
.........\sonar.au
.........\UFO.class
.........\ufostrip.gif
.........\UFO_Attack.class
.........\UFO_Attack.java