#29．编写一个Java应用程序，设计一个汽车类Vehicle，包含的属性有车轮个数
wheels和车重weight。小车类Car是Vehicle的子类，其中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。最后，写一个测试类来测试这些类的功
能。
package hanqi;
public class Vehicle {
private int wheels;
private int weight;
public int getWheels() {
return wheels;
}
public void setWheels(int wheels) {
this.wheels = wheels;
}
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
//构造
public Vehicle(int wheels,int weight)
{
this.weight=weight;
this.wheels=wheels;
}
}package hanqi;
public class Car extends Vehicle{
private int loader;
public int getLoader() {
return loader;
}
public void setLoader(int loader) {
this.loader = loader;
}
//构造
public Car(int wheels, int weight,int loader)
{
super(wheels,weight);
this.loader=loader;
}
}package hanqi;
public class Truck extends Car{
private int payload;
public int getPayload() {
return payload;
}
public void setPayload(int payload) {
this.payload = payload;
}
//构造
public Truck(int wheels, int weight, int loader, int payload)
{
super(wheels,weight,loader);
this.payload=payload;
}
}package hanqi;
public class TestVehicle {
public static void main(String[] args) {
Vehicle a = new Vehicle(4,3);
System.out.println("a有："+a.getWheels()+"个轮子\t："+a.getWeight()+"吨重");
Car b= new Car(4,3,4);
System.out.println("b有："+b.getWheels()+"个轮子\t："+b.getWeight()+"吨重\t可以坐"+b.getLoader()+"个人");
Truck c= new Truck(6,10,5,10);
System.out.println("c有："+c.getWheels()+"个轮子\t："+c.getWeight()+"吨重\t可以坐"+c.getLoader()+"个人\t载重"+c.getPayload()+"吨");
}
}