package base;import interfaces.AnimationInterface;import interfaces.GroundControllerInterface;import java.util.ArrayList;import java.util.List;import world.*;import world.Plane;import world.Tower;import agents.LocalControllerAgent;/** * The world. *  * @author Josh Villbrandt */public class World {			public static List<WorldObject> world_objects = new ArrayList<WorldObject>();	public static AnimationInterface animation_interface = null;	public static long update_interval = 1000;	public static int update_multiplier = 1;	public static WorldThread thread;		/** Sets the animation. */	public static final synchronized void setAnimation(AnimationInterface animation) {		animation_interface = animation;	}	/** Starts the world. */	public static final synchronized void startWorld() {		thread = new WorldThread(update_interval);		thread.start();	}	/** Starts the world. */	public static final synchronized void startWorld(long updateInterval) {		update_interval = updateInterval;		thread = new WorldThread(update_interval);		thread.start();	}	/** Starts the world. */	public static final synchronized void startWorld(long updateInterval, int updateMultiplier) {		update_interval = updateInterval;		update_multiplier = updateMultiplier;		thread = new WorldThread(update_interval);		thread.start();	}	/** Stops the world. */	public static final synchronized void stopWorld() {		thread.stop_thread();	}		public static final synchronized void update_world() {		if (animation_interface != null)			animation_interface.drawWorld(world_objects);	}		public static final boolean runways_exist() {		for (WorldObject world_object : world_objects) {			if ((world_object instanceof Runway)) {				return true;			}		}		// If for loop exits, there are no runways		return false;	}		public static final Plane get_plane(String call_num) {		for (WorldObject world_object : world_objects)			if ((world_object instanceof Plane)&&					(world_object.name.equals(call_num)))				return (Plane)world_object;		return null;	}		public static final LocalControllerAgent get_local_controller(Tower tower) {		for (WorldObject world_object : world_objects)			if ((world_object instanceof LocalControllerAgent)&&					(((LocalControllerAgent)world_object).tower == tower))				return (LocalControllerAgent)world_object;		return null;	}		public static final GroundControllerInterface get_ground_controller(Tower tower) {		/*		for (WorldObject world_object : world_objects) {			if (world_object instanceof GroundController)				System.out.println("found gc");			if ((world_object instanceof GroundController)&&					(((GroundController)world_object).tower == tower))				return (GroundController)world_object;		}*/		return tower.get_gc();	}		public static final void update_planes() {		for (WorldObject object : world_objects)			if (object instanceof Plane){				((Plane)object).update();				//object.get_world_object_state().update();			}	}	}