为什么结果money是NULL啊 不是赋值了么

package project;

public class InitialCar {

public static void main(String[] args) {

// TODO Auto-generated method stub

Car car=new Car();

car.num="冀6666";

car.name="奔驰";

car.money=4000000;

car.drive();

}

}

 另一个代码：

package project;

public class Car extends AutoMobile {

//double money=3000000;

 public void drive(){

System.out.println("奔驰代步");

 }

 public Car (){

System.out.println("name"+name+"money"+money+"Car类执行了");

 }

 public void qwe(){

System.out.println(super.money);

 }

}