编写一个Java应用程序，设计一个汽车类Vehicle

Question

3.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。

Answer 1

参考如下：

/**
 * @author huazie
 * @version 2.0.0
 * @since 2.0.0
 */
public class Test  {

    public static void main(String[] args) {
        Truck truck = new Truck(4, 1000, 5, 500);
        truck.display();
    }

}

class Vehicle {
    private int wheels; // 车轮个数
    private double weight; // 车重

    public Vehicle(int wheels, double weight) {
        this.wheels = wheels;
        this.weight = weight;
    }

    public int getWheels() {
        return wheels;
    }

    public void setWheels(int wheels) {
        this.wheels = wheels;
    }

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    public void display() {
        System.out.println("Vehicle{" + "wheels=" + wheels + ", weight=" + weight + '}');
    }
}

class Car extends Vehicle {
    private int loader; // 载人数

    public Car(int wheels, double weight, int loader) {
        super(wheels, weight);
        this.loader = loader;
    }

    public int getLoader() {
        return loader;
    }

    public void setLoader(int loader) {
        this.loader = loader;
    }

    public void display() {
        super.display();
        System.out.println("Car{" + "loader=" + loader + '}');
    }

}

class Truck extends Car {
    private double payload; // 载重量

    public Truck(int wheels, double weight, int loader, double payload) {
        super(wheels, weight, loader);
        this.payload = payload;
    }

    public double getPayload() {
        return payload;
    }

    public void setPayload(double payload) {
        this.payload = payload;
    }

    public void display() {
        super.display();
        System.out.println("Truck{" + "payload=" + payload + '}');
    }

}