public class PATollBoothA implements TollBooth{
// Array option

    // Instance Variables
 //   private int receiptsSinceCollection;
 //   private int trucksSinceCollection;  these are now identified somewhere
else

   //create the Arrray
	private Trucks[] PassingTrucks;
	int z; // to identify which index position within the array

    // Methods
    public PATollBooth() {
	PassingTrucks = new Trucks[10];  //instantiating PassingTrucks as an Array
        // we can delete this *** trucksSinceCollection = 0;        // Clear
out totals
	// we can delete this *** receiptsSinceCollection = 0;
    }
    public void calculateToll(Truck truck) {
        
	PassingTrucks[z] = truck;   //Adding object truck to the array
(axle,weight)
	z++;
	if (z > 9) z = 9; //to overwrite the tenth element in the array
	int axles = truck.getAxles();
        int totalWeight = truck.getTotalWeight();
        int tollDue = 5*axles + 10*(totalWeight/1000);  // Toll calculation
        System.out.print("Truck arrival - axles: ");
        System.out.print(axles);
        System.out.print(" total weight: ");
        System.out.print(totalWeight);
        System.out.print(" Toll due: ");
        System.out.println(tollDue);
        
    }
    public void onReceiptCollection() {
        System.out.print("*** Collecting receipts ***");
        displayData();
	PassingTrucks = null; // empties array
        //we can delete this *** trucksSinceCollection = 0;      // Clear
out totals
	//we can delete this *** receiptsSinceCollection = 0;
    }
    public void displayData() {
        
	Truck t;
	int trucksSinceCollection = 0;
	int receiptsSinceCollection = 0;
	int truckaxles;  // to declare datatype
	int trucktotalWeight;  // to declare datatype
	int trucktollDue;  // to declare datatype

	for(int i = 0; i < z; i++) { 
	t = PassingTrucks(i);

	//Toll calculation
	truckaxles = t.getAxles();
        trucktotalWeight = t.getTotalWeight();
        trucktollDue = 5*axles + 10*(totalWeight/1000);
	
	//Totaling Tolls
	trucksSinceCollection  = trucksSinceCollection  + 1;
	receiptsSinceCollection = receiptsSinceCollection + trucktollDue;

	}  // to end loop started after while statement
	System.out.print("Totals since last collection - Receipts: ");
        System.out.print(receiptsSinceCollection);
        System.out.print(" Trucks: ");
        System.out.println(trucksSinceCollection);
	
		
    }
}