class Engine {
public void start() {}
public void rev() {}
public void stop() {}
}
class Wheel {
public void inflate(int psi) {}
}
class Window {
public void rollup() {}
public void rolldown() {}
}
class Door {
public Window window = new Window();
public void open() {}
public void close() {}
}
class Car {
public Engine engine = new Engine();
public Wheel[] wheel = new Wheel[4];
public Door
left = new Door(),
right = new Door(); // 2-door
public Car() {
for(int i = 0; i < 4; i++)
wheel[i] = new Wheel();
}
}
public class MainClass{
public static void main(String[] args) {
Car car = new Car();
car.left.window.rollup();
car.wheel[0].inflate(72);
}
}