public class CricketDemo {
	public static void main(String[] args) {
		Cricket cricket = new Cricket(33);
		System.out.println("Fahrenheit == " + cricket.fahrenheit());
		System.out.println();

		MetricCricket metriccricket = new MetricCricket(33);
		System.out.println("Celsius == " + metriccricket.celsius());
		System.out.println("Fahrenheit == " + metriccricket.fahrenheit());
		System.out.println();

		KelvinCricket kelvincricket = new KelvinCricket(33);
		System.out.println("Kelvin == " + kelvincricket.kelvin());
		System.out.println("Celsius == " + kelvincricket.celsius());
		System.out.println("Fahrenheit == " + kelvincricket.fahrenheit());

		System.out.println();
		System.out.println(cricket);
		System.out.println(metriccricket);
		System.out.println(kelvincricket);

		System.exit(0);
	}
}

class Cricket {
	int chirps;	//per 15 seconds

	public Cricket(int chirps) {
		this.chirps = chirps;
	}

	public String toString() {
		return chirps + " chirps per 15 seconds";
	}

	public double fahrenheit() {
		return chirps + 39;
	}
}

class MetricCricket extends Cricket {
	public MetricCricket(int chirps) {
		super(chirps);
	}

	//inherits the toString and fahrenheit methods of class Cricket.

	public double celsius() {
		return (fahrenheit() - 32) * 5 / 9;
	}
}

class KelvinCricket extends MetricCricket {
	public KelvinCricket(int chirps) {
		super(chirps);
	}

	//inherits the toString, fahrenheit, and celsius methods
	//of class MetricCricket.

	public double kelvin() {
		return celsius() + 273.15;
	}
}