package headfirst.facade.hometheater;public class Tuner {	String description;	Amplifier amplifier;	double frequency;		public Tuner(String description, Amplifier amplifier) {		this.description = description;	} 	public void on() {		System.out.println(description + " on");	} 	public void off() {		System.out.println(description + " off");	} 	public void setFrequency(double frequency) {		System.out.println(description + " setting frequency to " + frequency);		this.frequency = frequency;	} 	public void setAm() {		System.out.println(description + " setting AM mode");	} 	public void setFm() {		System.out.println(description + " setting FM mode");	}          public String toString() {                return description;        }}