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代码如下：
public class Demo {
?? ?public static void main(String[] args) {
?? ??? ?// TODO Auto-generated method stub
?? ??? ?Engine benzEngine=new Engine();
?? ??? ?Car myCar=new Car("Benz",130,"red","suv",18,benzEngine);
?? ??? ?myCar.showInfo();
?? ??? ?
?? ??? ?Car myCar2=new Car();
?? ??? ?myCar2.showInfo();
?? ?}
}
//汽车类
public class Car {
?? ?String carBrand;
?? ?int price;
?? ?String color;
?? ?String motorcycleType;
?? ?double oilConsumption;
?? ?Engine carEngine;
?? ?
?? ?/*构造代码块
?? ?{
?? ??? ?System.out.println("我是构造代码块");
?? ?}*/
?? ?
?? ?//构造方法
?? ?public Car(){
?? ??? ?carEngine=new Engine(4.5,220);
?? ?}
?? ?public Car(String _carBrand,int _price,String _color,String _motorcycleType,double _oilConsumption,Engine _engine){
?? ??? ?carBrand=_carBrand;
?? ??? ?price=_price;
?? ??? ?color=_color;
?? ??? ?motorcycleType=_motorcycleType;
?? ??? ?oilConsumption=_oilConsumption;
?? ??? ?carEngine=_engine;
?? ?}
?? ?
?? ?public void start(){
?? ??? ?System.out.println("小汽车启动，实际上发动机点火");
?? ??? ?carEngine.start();
?? ?}
?? ?public void stop(){
?? ??? ?System.out.println("小汽车停止，实际上发动机熄火");
?? ??? ?carEngine.stop();
?? ?}
?? ?
?? ?public void showInfo(){
?? ??? ?System.out.println("汽车信息-----------");
?? ??? ?System.out.println("carBrand:"+carBrand);
?? ??? ?System.out.println("price:"+price);
?? ??? ?System.out.println("color:"+color);
?? ??? ?System.out.println("motorcycleType:"+motorcycleType);
?? ??? ?System.out.println("oilConsumption:"+oilConsumption);
?? ??? ?carEngine.showInfo();
?? ?}
}
//引擎类
public class Engine {
?? ?double displacement;
?? ?int powerSize;
?? ?
?? ?public Engine(){
?? ?}
?? ?public Engine(double _displacement,int _powerSize){
?? ??? ?displacement=_displacement;
?? ??? ?powerSize=_powerSize;
?? ?}
?? ?
?? ?public void start(){
?? ??? ?System.out.println("发动机点火");
?? ?}
?? ?public void stop(){
?? ??? ?System.out.println("发动机熄火");
?? ?}
?? ?
?? ?public void showInfo(){
?? ??? ?System.out.println("displacement:"+displacement);
?? ??? ?System.out.println("powerSize:"+powerSize);
?? ?}
}
（编辑：北几岛）
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