public class Ticket {

	int ticketNumber;
	int ticketPrice;

	public Ticket(int ticketNumber) {

		this.ticketNumber = ticketNumber;

	}

	public Ticket() {

	}

	public int getTicketNumber() {
		return ticketNumber;
	}

	public void setTicketNumber(int ticketNumber) {
		this.ticketNumber = ticketNumber;
	}

	public int getTicketPrice() {
		return ticketPrice;
	}

	public void setTicketPrice(int ticketPrice) {
		this.ticketPrice = ticketPrice;
	}

}


// new AdvanceTicket Subclass was created with the parent class Ticket
public class AdvanceTicket extends Ticket {

	int ticketNumber;
	int numberOfDaysBeforeEvent;
	int price = 40;

	public int getTicketNumber() {
		return ticketNumber;
	}

	public void setTicketNumber(int ticketNumber) {
		this.ticketNumber = ticketNumber;
	}

	public int getPrice() {
		return price;
	}

	public void setPrice(int price) {
		this.price = price;
	}

	public int getNumberOfDaysBeforeEvent() {
		return numberOfDaysBeforeEvent;
	}

	public void setNumberOfDaysBeforeEvent(int numberOfDaysBeforeEvent) {
		this.numberOfDaysBeforeEvent = numberOfDaysBeforeEvent;
	}

	public AdvanceTicket(int ticketNumber, int daysBeforeEvent) {
		this.ticketNumber = ticketNumber;
		this.numberOfDaysBeforeEvent = daysBeforeEvent;
	}

	public AdvanceTicket() {

	}

	@Override
	public String toString() {

		if (this.getNumberOfDaysBeforeEvent() > 10)
			this.setPrice(30);

		return "Ticket number: " + this.getTicketNumber() + ", price: " + this.getPrice() + "." + " purchased "
				+ this.getNumberOfDaysBeforeEvent() + " days before the event. \n";
	}

// driver method
	public static void main(String args[]) {

         // initiate the AdvanceTicket class
		AdvanceTicket ad = new AdvanceTicket(27, 12);
		AdvanceTicket ad1 = new AdvanceTicket(44, 4);
		AdvanceTicket ad2 = new AdvanceTicket(63, 15);
		AdvanceTicket ad3 = new AdvanceTicket(54, 2);

		System.out.println(ad);
		System.out.println(ad1);
		System.out.println(ad2);
		System.out.println(ad3);

	}

}

Output:

Ticket number: 27, price: 30. purchased 12 days before the event. 

Ticket number: 44, price: 40. purchased 4 days before the event. 

Ticket number: 63, price: 30. purchased 15 days before the event. 

Ticket number: 54, price: 40. purchased 1 days before the event.