编写一个java程序，设计一个汽车类Vehicle，包含的属性有车轮的个数wheels和车重weight。小汽车类Car是Vehicle的子类，包含的属性有载人数loader。卡车类Truck是Car类的子类，其中包含的属性有载重量payload。每个类都有构造方法和输出相关数据的方法。
代码如下：
（1）源代码
public class Vehicle {
int wheels;
double weights;
Vehicle(int wheels,double weights){ //这是构造方法
this.wheels=wheels;
this.weights=weights;
}
void disMessage(){
System.out.println("这个车车轮个数是"+wheels+"重量是"+weights+"斤");
}
public static void main(String[] args){
Vehicle v=new Vehicle(8,10.00);
smallCar c=new smallCar(6);
Truck t=new Truck(10);
v.disMessage();
c.disM();
t.disM2();
t.disM3();
}
}
class smallCar extends Vehicle{
int loader;
smallCar(int loader){
super(8,10.00);
this.loader=loader;
}
void disM(){
System.out.println("这个小汽车可载"+loader+"人");
}
}
class Truck extends smallCar{
int payload;
Truck(int payload){
super(6);
this.payload=payload;
}
void disM2(){
System.out.println("这卡车载重为"+payload+"kg");
}
void disM3(){
System.out.println("这卡车有"+wheels+"个轮子"+"车重有"+weights+"斤"+"可载"+loader+"人"+"载重为"+payload+"斤");
}
}