Composition with public objects

Submitted by:Jhon Smith

Date added:15 December, 2011

Category:Java

An Example Java Code for Composition with public objects

Tags: composition

Code Snippet:

// : c06:Car.java
// Composition with public objects.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002

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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