test7.14

class Engine
{public void start(){}
public void rev(){}
public void stop(){}
public void service(){System.out.println("Service ");}
}
class Wheel
{public void inflate(int psi){}}
class Window{
public void roolup(){}
public void rooldown(){}
}
class Door
{public Window window=new Window();
public void open(){}
public void close(){}
}
public class Car {
public Engine engine=new Engine();
public Wheel[] wheel=new Wheel[4];
public Door left=new Door();
public Door right=new Door();
public Car(){
for(int i=0;i<4;i++)
wheel[i]=new Wheel();
}
public static void main(String[] args) {
Car car=new Car();
car.left.window.roolup();
car.wheel[2].inflate(72);
car.engine.service();
}
}