Java基础-继承-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。

#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");

        
}
}