「Java学习打卡」39、面向对象题目练习

最新推荐文章于 2023-04-22 23:22:58 发布

原创最新推荐文章于 2023-04-22 23:22:58 发布 · 475 阅读

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本文介绍了一个基于面向对象编程的汽车类设计案例，包括基本的Vehicle类，派生的Car类和Truck类。Vehicle类包含车轮数量和车重属性，Car类增加了载人数属性，而Truck类则进一步引入了载重量属性。每个类都实现了显示自身信息的方法。

设计一个汽车类vehicle，包含的数据成员有车轮个数wheels和车重weight。小车类car是它的派生类，其中包含载人数passenge_load，卡车类Truck是Car类的子类，其中包含的属性有载重量payload。每个类都有相关数据的输出方法。在主程序中定义一个car类对象，对其车轮个数、车重、载人数进行设置并显示。

class vehicle
{
    private int wheels;
    private float weight;

    vehicle(int wheels, float weight) {
        wheel_load(wheels,weight);
        get_wheels();
        get_weight();
        showInformation();
    }

    void wheel_load(int wheels, float weight) {
        this.wheels = wheels;
        this.weight = weight;
    }

    int get_wheels() {
        return wheels;
    }

    float get_weight() {
        return weight / wheels;
    }

    void showInformation() {
        System.out.print("车轮:" + wheels + "个");
        System.out.println(" 重量:" + weight + "公斤");
    }
}

class car extends vehicle {
    int passenger_load;

    car(int wheels, float weight, int passengers) {
        super(wheels, weight);
        passenger_load = passengers;
        get_passengers();

        this.show();
    }

    int get_passengers() {
        return passenger_load;
    }

    void show() {
        System.out.print("车型:小车");
        System.out.println(" 载人:" + passenger_load + "人"+"\n");

    }
}

class truck extends vehicle {
    int passenger_load;
    float payload;
    float weight;

    truck(int wheels, float weight, int passengers, float max_load) {
        super(wheels, weight);
        this.weight = weight;
        this.passenger_load=passengers;
        this.payload=max_load;

        get_passengers();
        efficiency();
        show();
    }

    int get_passengers() {
        return passenger_load;
    }

    float efficiency() {
        return payload / (payload + weight);
    }

    void show() {
        System.out.print("车型:卡车");
        System.out.print(" 载人:" + passenger_load + "人");
        System.out.println(" 效率:" + efficiency()+"\n");
    }
}

public class Test {
    public static void main(String[] args) {
        car car1 = new car(4, 2000, 5);
        truck tru1= new truck (10, 8000, 3, 340000);
        System.out.println("输出结果：");
        car1.show();
        tru1.show();
    }
}