Spawning the aliens

Now that all the alien components, as well as AlienLaserSpawner, are coded, we can put them all to work in the game. It will take three steps, as follows:

1. Update GameEngine's deSpawnReSpawn method to spawn some of each alien.
2. Update the Level class to add some aliens and alien lasers to the ArrayList of objects.
3. Update the GameObjectFactory class to handle instantiating the correct component classes (that we just coded) when the level class requests the various alien GameObject instances be built.

Let's complete these steps now.

Updating the GameEngine class

Add this code to the end of the deSpawnReSpawn method:

…
for (int i = Level.FIRST_ALIEN; 
     i != Level.LAST_ALIEN + 1; i++) {
     
     objects.get(i).spawn(objects
          .get(Level.PLAYER_INDEX).getTransform());
}

This loops through the appropriate...