public class FlyingVehicle extends Vehicle	// subclass which represents all flying vehicles (those that move through the air)
{											// this class of Vehicle will not be impacted by rough terrain
	protected boolean refuelInFlight;	// can this vehicle refuel while flying?  impacts distance
	protected boolean vtolCapable;		// is this vehicle capable of vertical takeoffs/landings?  impacts utility
	
	public FlyingVehicle()				// no arg constructor
	{
		this("unknown");	
	}
	
	public FlyingVehicle(String t)		// initialize all new instance data and override those of parent class that differ
	{
		super(t);
		refuelInFlight=false;
		vtolCapable=false;
		speed=200;
		armament=2;
	}
	
	// accessors for new instance data
	public boolean getVtol()
	{
		return vtolCapable;
	}
	
	public boolean getRefuel()
	{
		return refuelInFlight;
	}
	
	// compute the distance that this vehicle can travel - not part of the interface so is protected
	protected int getDistance()
	{
		if(refuelInFlight) return 10000;	// if can refuel then distance is nearly unlimited
		else return speed*10;				// otherwise distance is based on fuel
	}
	
	@Override
	public String toString()		// add to parent toString output of new instance data
	{
		return super.toString() + " is VTOL capable " + vtolCapable + " can refuel in flight " + refuelInFlight;
	}

	// battle utility for flying vehicle based on whether the vehicle can travel the distance needed, if there is rough terrain to
	// avoid, if there is a need for ground support (troops) and if this vehicle can land to drop them off or not
	@Override
	public int getBattleUtility(boolean night, boolean roughTerrain, boolean needGroundSupport, boolean needHeavyArms, boolean antiAircraftGuns, boolean equipment, int distance)
	{
		int score=0;
		if(distance>getDistance()) score-=15; else score+=30;
		if(roughTerrain) score+=5;
		if(!needGroundSupport) score+=5;
		if(needGroundSupport&&vtolCapable&&capacity>2) score+=capacity;
		return score;
	}
}