public class GreetingCard {
	private String sender;
	private String recipient;	
 
	public GreetingCard(String recipient, String sender) {
		this.recipient = recipient;
		this.sender = sender;
	}
 
	public void setRecipient(String recipient) {
		this.recipient = recipient;
	}
 
	protected String greetingMsg() {
		return "Best Greetings!";
	}
 
	public String showCard() {
		return "Dear " + this.recipient + ", \n" + this.greetingMsg() + "\n" + this.sender;
	}	
}
 
 
public class BirthdayCard extends GreetingCard {
	private int age;	
 
	public BirthdayCard(String recipient, String sender, int age) {
		super(recipient, sender);
		this.age = age;
	}
 
	protected String greetingMsg() {
		return "Happy " + age + "th Birthday!";
	}	
}
 
 
public class WeddingCard extends GreetingCard {
	private String bride;
	private String groom;	
 
	public WeddingCard(String bride, String groom, String sender) {
		super(bride + " & " + groom, sender);
		this.bride = bride;
		this.groom = groom;
	}
 
	public void setBride(String bride) {
		this.bride = bride;
		super.setRecipient(this.bride + " & " +  this.groom);
	}
 
	public void setGroom(String groom) {
		this.groom = groom;
		super.setRecipient(this.bride + " & " +  this.groom);
	}
 
	protected String greetingMsg() {
		return "May you live happily ever after";
	}	
}
 
 
class AdultBirthday extends BirthdayCard{
	public AdultBirthday(String recipient, String sender, int age) {
		super(recipient, sender, age);
	}
 
	protected String greetingMsg() {
		return super.greetingMsg() + "\n" +"You haven't changed at all!!";
	}	
}
 
 
public class YouthBirthday extends BirthdayCard {
	public YouthBirthday(String recipient, String sender, int age) {
		super(recipient, sender, age);
	}
 
	protected String greetingMsg() {
		return super.greetingMsg() + "\n" +"How have you grown!!";
	}	
}

 
class ManyCards {
	public static void main(String[] args) {
		
		GreetingCard[] gCards = new GreetingCard[5];
		gCards[0] = new GreetingCard("Recipient", "Sender");
		gCards[1] = new BirthdayCard("Recipient", "Sender", 18);
		gCards[2] = new WeddingCard("Bride", "Groom", "Sender");
		gCards[3] = new YouthBirthday("Recipient", "Sender", 8);
		gCards[4] = new AdultBirthday("Recipient", "Sender", 30);
		
		for (int i=0; i <= 4; i++) {
			System.out.println(gCards[i].showCard()); }
	}	
}

Object[] cards = {
 
     new GreetingCard("Recipient", "Sender"), 
     new BirthdayCard("Recipient", "Sender", 18),
     new WeddingCard("Bride", "Groom", "Sender"),
     new YouthBirthday("Recipient", "Sender", 8),
     new AdultBirthday("Recipient", "Sender", 30),
};

        for (int i = 0; i < cards.length; i++){
            GreetingCard nextCard = (GreetingCard)cards[i];
            System.out.println(nextCard.showCard());
        } 

        System.out.println("My " + cards.length + " cards include the following types:");
        for (int i = 0; i < cards.length; i++){
            GreetingCard nextCard = (GreetingCard)cards[i];
            if (nextCard instanceof GreetingCard) System.out.println("Card number " + (i + 1) + " is a Greeting Card");
            if (nextCard instanceof BirthdayCard) System.out.println("Card number " + (i + 1) + " is a Birthday Card");
            if (nextCard instanceof WeddingCard) System.out.println("Card number " + (i + 1) + " is a Wedding Card");
            if (nextCard instanceof AdultBirthday) System.out.println("Card number " + (i + 1) + " is a Adult Birthday Card");
            if (nextCard instanceof YouthBirthday) System.out.println("Card number " + (i + 1) + " is a Youth Birthday Card");
        }

class MyCards{
 
    public static void main(String[] args){
        Object[] cards = {
            new GreetingCard("Recipient", "Sender"), 
            new BirthdayCard("Recipient", "Sender", 18),
            new WeddingCard("Bride", "Groom", "Sender"),
            new YouthBirthday("Recipient", "Sender", 8),
            new AdultBirthday("Recipient", "Sender", 30),
        }; 
        for (int i = 0; i < cards.length; i++){
            GreetingCard nextCard = (GreetingCard)cards[i];
            System.out.println(nextCard.showCard());
        }
        System.out.println("My " + cards.length + " cards include the following types:");
        for (int i = 0; i < cards.length; i++){
            GreetingCard nextCard = (GreetingCard)cards[i];
            if (nextCard instanceof GreetingCard) System.out.println("Card number " + (i + 1) + " is a Greeting Card");
            if (nextCard instanceof BirthdayCard) System.out.println("Card number " + (i + 1) + " is a Birthday Card");
            if (nextCard instanceof WeddingCard) System.out.println("Card number " + (i + 1) + " is a Wedding Card");
            if (nextCard instanceof AdultBirthday) System.out.println("Card number " + (i + 1) + " is a Adult Birthday Card");
            if (nextCard instanceof YouthBirthday) System.out.println("Card number " + (i + 1) + " is a Youth Birthday Card");
        }
    }
}