<< 2006Customer | APQuestionsTrailIndex | 2005Average >>

Ticket

public abstract class Ticket {


private int serialNumber;

public Ticket()

{ serialNumber= getNextSerialNumber(); }

public abstract double getPrice();

public String toString()
{  return "\nNumber: " + serialNumber + "\nPrice: " + getPrice();}

private static int getNextSerialNumber()
{ return (int)(Math.random()*10000); }


}

Advance

public class Advance extends Ticket{

	int daysBeforeShow;

	public Advance(int d)
	{ super();

	   daysBeforeShow = d;
	}

	public double getPrice(){
		if (daysBeforeShow >9)
			return 30.00;
	    return 40.00;

	}

}

Note: In class we had something that didn't quite work... can you see the subtle difference and what is wrong with this?

//INCORRECT VERSION:
public class Advance extends Ticket{

	int daysBeforeShow;

	public Advance(int d)
	{ super();

	   int daysBeforeShow = d;
	}

	public double getPrice(){
		if (daysBeforeShow >9)
			return 30.00;
	    return 40.00;

	}

}

StudentAdvance

public class StudentAdvance extends Advance {

    public StudentAdvance(int d) { super(d); }

    public double getPrice()
    { 
        return 0.5*super.getPrice(); 
    }
    public String toString()
    { 
        return super.toString()+"\n(Student ID Required)";
    }
}

A class to test out the Ticket Stuff

public class TicketTester
{

	public static void main(String[] args)
	{
		Advance late=new Advance(2);
		Advance ok=new Advance(10);
		StudentAdvance lateStudent=new StudentAdvance(2);
		StudentAdvance okStudent=new StudentAdvance(10);
		System.out.println("Late price (should be 40): "+late);
		System.out.println("adv price (should be 30): "+ok);
		System.out.println("Late Student price (should be 20): "+lateStudent);
		System.out.println("Student advance price (should be 15): "+okStudent);
	}


}