Java基礎-繼承-編寫一個Java應用程序，設計一個汽車類Vehicle，包含的屬性有車輪個數 wheels和車重weight。小車類Car是Vehicle的子類，其中包含的屬性有載人數 loader。卡車類Truck是Car類的子類，其中包含的屬性有載重量payload。每個 類都有構造方法和輸出相關數據的方法。最后，寫一個測試類來測試這些類的功 能。

#29．編寫一個Java應用程序，設計一個汽車類Vehicle，包含的屬性有車輪個數

wheels和車重weight。小車類Car是Vehicle的子類，其中包含的屬性有載人數

loader。卡車類Truck是Car類的子類，其中包含的屬性有載重量payload。每個

類都有構造方法和輸出相關數據的方法。最后，寫一個測試類來測試這些類的功

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;
    }
    
    //構造
    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;
    }
    
    //構造
    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;
    }
    
    //構造
    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()+"個輪子\t："+a.getWeight()+"噸重");
    
        
        Car  b= new Car(4,3,4);
        System.out.println("b有："+b.getWheels()+"個輪子\t："+b.getWeight()+"噸重\t可以坐"+b.getLoader()+"個人");
    
        Truck  c= new Truck(6,10,5,10);
        System.out.println("c有："+c.getWheels()+"個輪子\t："+c.getWeight()+"噸重\t可以坐"+c.getLoader()+"個人\t載重"+c.getPayload()+"噸");

 } }