JAVA多态练习题_某汽车租赁公司出租多种车辆，车型及租金情况如下：

某汽车租赁公司出租多种车辆，车型及租金情况如下：

 

n 编写程序实现计算租赁价  MotoVehicle

分析

 

4、需求说明：

输入提示需求,计算出对应租金

5、需求说明：

新购置了卡车，根据吨位，租金每吨每天50

对系统进行扩展，计算汽车租赁的总租金

 

package day13;
//机动车类
public abstract class MotoVehicle {
    //车牌号    
    String no=null;
    //品牌
    String brand=null;
    //颜色
    char color;
    //里程
    int mileage;
    //总金额
    int num;
    
    
    
    public abstract int CalcRent(int day);
    
}

package day13;
//大车类
public class Bus extends MotoVehicle{
    
    private int seatCount;
    

    
    public Bus(String no,int seatCount) {
        super();
        this.no=no;
        this.seatCount = seatCount;
    }


     //方法重写
    @Override
    public int CalcRent(int day) {
        
        return 0;
    }
    //方法重载
    public int CalcRent(int days,int seatCount){
        if(seatCount<=16){
            num=800*days;
        }
        else if(seatCount>16){
            num=1500*days;
        }
        System.out.println("费用为:"+num);
        return num;
    }

    
    
}

package day13;
//小车类
public class Car extends MotoVehicle{
    
    private String type;
    
    public Car(String no,String type) {
        super();
        this.no=no;
        this.type = type;
    }
    //方法重写
    @Override
    public int CalcRent(int day) {
        
        return 0;
    }
    //方法重载
    public int CalcRent(int days,String type){
        //
        switch (type) {
        case "1":
            num=600*days;
            break;
        case "2":
            num=500*days;
            break;
        case "3":
            num=300*days;
            break;
        
        default:
            System.out.println("输入有误");
            break;
        }
        System.out.println("费用为"+num);
        return num;
    }
}

package day13;

public class Truck extends MotoVehicle{
    int  tonnage;
    
    public Truck(String no,int tonnage) {
        super();
        this.no=no;
        this.tonnage = tonnage;
    }

    //重写方法
    @Override
    public int CalcRent(int day) {
        
        return 0;
    }
    //重载方法
    public int CalcRent(int day,int tonnage){
        num=tonnage*day*50;
        System.out.println("费用为"+num);
        return num;
    }
    

}

package day13;

import java.util.Scanner;

public class Test {

    public static void main(String[] args) {
        Scanner reader=new Scanner(System.in);
        System.out.println("请输入数字选择车型:(1轿车),(2客车),(3.卡车)");
        int m=reader.nextInt();
        if(m==1){
            System.out.println("1.别克商务舱GL8");
            System.out.println("2.宝马55i");
            System.out.println("3.别克林荫大道");
            System.out.println("请输入轿车品牌数字:");
            String b=reader.next();
            
        
            System.out.println("请输入租赁天数:");
            int days=reader.nextInt();
            
            //创建对象
            Car car=new Car("0",b);
            car.CalcRent(days, b);
            
        }else if(m==2){
            System.out.println("请输入座位数:");
            int c=reader.nextInt();
            System.out.println("请输入租赁天数:");
            int  days=reader.nextInt();
            
            //创建对象并调用
            Bus bus=new Bus("0",c);
            bus.CalcRent(days, c);
        }else if(m==3){
            System.out.println("请输入吨位:");
            int d=reader.nextInt();
            System.out.println("请输入要租赁的天数:");
            int days=reader.nextInt();
            
            //创建对象并使用
            Truck truck=new Truck("0", d);
            truck.CalcRent(days, d);
        }
        else{
            System.out.println("输入有误!");
        }

    }

}

运行截图: