class TestCommand { public static void main(String[] args) { DvdName jayAndBob = new DvdName("Jay and Silent Bob Strike Back"); DvdName spongeBob = new DvdName("Sponge Bob Squarepants - " + "Nautical Nonsense and Sponge Buddies"); System.out.println("as first instantiated"); System.out.println(jayAndBob.toString()); System.out.println(spongeBob.toString()); CommandAbstract bobStarsOn = new DvdCommandNameStarsOn(jayAndBob); CommandAbstract bobStarsOff = new DvdCommandNameStarsOff(jayAndBob); CommandAbstract spongeStarsOn = new DvdCommandNameStarsOn(spongeBob); CommandAbstract spongeStarsOff = new DvdCommandNameStarsOff(spongeBob); bobStarsOn.execute(); spongeStarsOn.execute(); System.out.println(" "); System.out.println("stars on"); System.out.println(jayAndBob.toString()); System.out.println(spongeBob.toString()); spongeStarsOff.execute(); System.out.println(" "); System.out.println("sponge stars off"); System.out.println(jayAndBob.toString()); System.out.println(spongeBob.toString()); } }

The above code is an example of the Command design pattern.