实操： 请使用抽象类的思想实现案例，并在测试类中进行测试 （1）定义车类（ Car） 成员变量：品牌（ brand ）、价格（price）、颜色（colour） 构造方法：无参、带参 成员方法：get/set方法、show( ) 抽象方法 function(); （2）定义跑车类(SportsCar) 构造方法：无参、带参 成员方法：重写function(){…}，并输出一条语句“超级跑车” （3）货车类(van) 成员变量：车轮数（wheels） 构造方法：无参、带参 成员方法：get/set方法，重写function(){…}，并输出一条语句“大型货车” （4）定义测试类（CarDemo），使用无参创建对象和有参创建对象写代码测试 java案例

下面是使用抽象类的思想实现案例的代码：

Car.java

public abstract class Car {
    private String brand;
    private double price;
    private String colour;
    
    public Car() {
    }
    
    public Car(String brand, double price, String colour) {
        this.brand = brand;
        this.price = price;
        this.colour = colour;
    }
    
    public String getBrand() {
        return brand;
    }
    
    public void setBrand(String brand) {
        this.brand = brand;
    }
    
    public double getPrice() {
        return price;
    }
    
    public void setPrice(double price) {
        this.price = price;
    }
    
    public String getColour() {
        return colour;
    }
    
    public void setColour(String colour) {
        this.colour = colour;
    }
    
    public void show() {
        System.out.println("Brand: " + brand);
        System.out.println("Price: " + price);
        System.out.println("Colour: " + colour);
    }
    
    public abstract void function();
}

SportsCar.java

public class SportsCar extends Car {
    public SportsCar() {
        super();
    }
    
    public SportsCar(String brand, double price, String colour) {
        super(brand, price, colour);
    }
    
    @Override
    public void function() {
        System.out.println("Super Sports Car");
    }
}

Van.java

public class Van extends Car {
    private int wheels;
    
    public Van() {
        super();
    }
    
    public Van(String brand, double price, String colour, int wheels) {
        super(brand, price, colour);
        this.wheels = wheels;
    }
    
    public int getWheels() {
        return wheels;
    }
    
    public void setWheels(int wheels) {
        this.wheels = wheels;
    }
    
    @Override
    public void function() {
        System.out.println("Large Van");
    }
}

CarDemo.java

public class CarDemo {
    public static void main(String[] args) {
        Car car1 = new SportsCar("Ferrari", 3000000.0, "Red");
        car1.show();
        car1.function();
        
        System.out.println("----------------------");
        
        Car car2 = new Van("Benz", 800000.0, "White", 8);
        car2.show();
        car2.function();
    }
}

输出结果：

Brand: Ferrari
Price: 3000000.0
Colour: Red
Super Sports Car
----------------------
Brand: Benz
Price: 800000.0
Colour: White
Large Van