car.java

Java编程思想 第六课 全源码

//: c06:Car.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// Composition with public objects.
import java.util.*;
import java.io.*;
class Prt {
		Prt (String s){
		System.out.println(""+s);
	}
}
	
class Engine {
  Prt s = new Prt("Class Engine");
  public void start() {}
  public void rev() {}
  public void stop() {}
}

class Wheel {
	Prt s= new Prt("Class Wheel");
  public void inflate(int psi) {System.out.println("Wheel's inflate + "+ psi);}
}

class Windows {
	Prt s= new Prt("Class Windows");
  public void rollup() {System.out.println("Windows's rollup()");}
  public void rolldown() {}
}

class Door {
	Prt s = new Prt("Class Door");
  public Windows window = new Windows();
  public void open() {}
  public void close() {}
}

public class Car {
	Prt s = new Prt("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();
  }
  //System.out.println("Class Car");
  public static void main(String[] args) {
  	System.out.println("Main");
    Car car = new Car();
    car.left.window.rollup();
    car.wheel[0].inflate(72);
  }
} ///:~