OnJava8-Examples/reuse/Car.java at master · xinan-w/OnJava8-Examples · GitHub

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// reuse/Car.java

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

// Composition with public objects

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() {}

}

public 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 static void main(String[] args) {

Car car = new Car();

car.left.window.rollup();

car.wheel[0].inflate(72);

}

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