Car Problem

public class Car {

	private int tank;
	private int speed;
	private Stereo stereo;

	public Car() {
		this.tank = 20;
		this.speed = 70;
		this.stereo = new Stereo();
		stereo.setVolume(100);
		stereo.setStation(50);
	}

	public Car(int tank, int speed, Stereo stereo) {
		this.tank = tank;
		this.speed = speed;
		this.stereo = new Stereo();
	}

	public int getTank() {
		return tank;
	}
	public int getSpeed() {
		return speed;
	}
	public int getStation() {
		return stereo.getStation();
	}
	public int getVolume() {
		return stereo.getVolume();
	}

}


public class Main {

	public static void main(String[] args) {

		Stereo stereo = new Stereo();

		Car car1 = new Car();
		Car car2 = new Car(30, 50, stereo);

		System.out.printf("Car 1 tank is: %d%n", car1.getTank());
		System.out.printf("Car 1 speed is: %d%n", car1.getSpeed());
		System.out.printf("Car 1 station is: %d%n", car1.getStation());
		System.out.printf("Car 1 volume is: %d%n%n", car1.getVolume());

		System.out.printf("Car 2 tank is: %d%n", car2.getTank());
		System.out.printf("Car 2 speed is: %d%n", car2.getSpeed());
		System.out.printf("Car 2 station is: %d%n", car2.getStation());
		System.out.printf("Car 2 volume is: %d%n", car2.getVolume());

	}
}


public class Stereo {

	private int station;
	private int volume;

	public void setStation(int station) {
		this.station = station;
	}
	public int getStation() {
		return station;
	}

	public void setVolume(int volume) {
		this.volume = volume;
	}
	public int getVolume() {
		return volume;
	}
}