class Room {
	private static int nextID = 1; //id of next room to be created

	protected int id;
	private int mess; //messiness index
	
	public Room(int mess) {
		this.mess = mess;
		id = nextID;
		nextID++;
	}
	
	public String toString() {
		return "Room " + id;
	}
	
	public void clean() {
		mess--;
		if (mess<0)  mess=0;
	}
	
	public void report() {
		System.out.println(
			toString()+", has messiness index "+mess);
	}
	
	public static void countRooms() {
		System.out.println((nextID-1)+" rooms in total");
	}
} //class Room

class Bathroom extends Room {

	private boolean hasShower;
	
	public Bathroom(int mess, boolean hasShower) {
		super(mess);
		this.hasShower = hasShower;
	}
	
	public String toString() {
		String line = super.toString();
		line += ", a bathroom";
		if (hasShower)
			line += " with shower";
		return line;
	}
	
	public void majorCleanUp() {
		clean();  clean();  clean();  clean();
	}
} //class Bathroom

public class House {
	public static void main(String[] args) {
		Room r1 = new Room(5);
		Bathroom r2 = new Bathroom(10,true);
		
		// Method invocation (super and sub class), overriding 
		System.out.println(r1);
		System.out.println(r2);
		r1.report();
		r2.report();
		System.out.println();
		r1.clean();  r1.report();
		r2.clean();  r2.report();
		r2.majorCleanUp();  r2.report();
		//r1.majorCleanUp();
		System.out.println();
		
		// Polymorphism	
		Room r3 = new Bathroom(20,false);
		System.out.println(r3);
		r3.clean();  r3.report();
		//r3.majorCleanUp();
		((Bathroom)r3).majorCleanUp();
		r3.report();
		System.out.println();
		
		// Static methods and variables
		Room.countRooms();
		Bathroom.countRooms();
	}
} //class House