SquashMonster's games programming - lesson 2, example code b

//In Java, you need to use an iterator if you plan to remove objects from a list as you cycle through it
		//The <Brackets> are a template - this means it's an Iterator that only has Entities.
		//"enemies" is a LinkedList<Entity> I have defined elsewhere.  Yes, it's a linked list of only Entities.
		Iterator<Entity> enemyIterator = enemies.iterator();
		while(enemyIterator.hasNext())
		{
			//Grab the next entity
			Entity entity = enemyIterator.next();
			//Have it do its step
			entity.doStep();
			//Check collisions
			//This is a Java for-each loop, it pulls each Entity from playerBullets and stores it in "bullet"
			//I can use it here instead of an iterator because I'm not removing from playerBullets in this loop
			for(Entity bullet : playerBullets)
			{
				if(entity.checkCollision(bullet))
				{
					//It's always easiest to check collisions from one entity, then handle collisions in both directions
					entity.handleCollision(bullet);
					bullet.handleCollision(entity);
				}
			}
			//Check death
			if(entity.isDead())
			{
				//Removes the object from the list
				enemyIterator.remove();
			}
		}