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

 1 package day13;
 2 //机动车类
 3 public abstract class MotoVehicle {
 4     //车牌号    
 5     String no=null;
 6     //品牌
 7     String brand=null;
 8     //颜色
 9     char color;
10     //里程
11     int mileage;
12     //总金额
13     int num;
14     
15     
16     
17     public abstract int CalcRent(int day);
18     
19 }

 1 package day13;
 2 //大车类
 3 public class Bus extends MotoVehicle{
 4     
 5     private int seatCount;
 6     
 7 
 8     
 9     public Bus(String no,int seatCount) {
10         super();
11         this.no=no;
12         this.seatCount = seatCount;
13     }
14 
15 
16      //方法重写
17     @Override
18     public int CalcRent(int day) {
19         
20         return 0;
21     }
22     //方法重载
23     public int CalcRent(int days,int seatCount){
24         if(seatCount<=16){
25             num=800*days;
26         }
27         else if(seatCount>16){
28             num=1500*days;
29         }
30         System.out.println("费用为:"+num);
31         return num;
32     }
33 
34     
35     
36 }

 1 package day13;
 2 //小车类
 3 public class Car extends MotoVehicle{
 4     
 5     private String type;
 6     
 7     public Car(String no,String type) {
 8         super();
 9         this.no=no;
10         this.type = type;
11     }
12     //方法重写
13     @Override
14     public int CalcRent(int day) {
15         
16         return 0;
17     }
18     //方法重载
19     public int CalcRent(int days,String type){
20         //
21         switch (type) {
22         case "1":
23             num=600*days;
24             break;
25         case "2":
26             num=500*days;
27             break;
28         case "3":
29             num=300*days;
30             break;
31         
32         default:
33             System.out.println("输入有误");
34             break;
35         }
36         System.out.println("费用为"+num);
37         return num;
38     }
39 }

 1 package day13;
 2 
 3 public class Truck extends MotoVehicle{
 4     int  tonnage;
 5     
 6     public Truck(String no,int tonnage) {
 7         super();
 8         this.no=no;
 9         this.tonnage = tonnage;
10     }
11 
12     //重写方法
13     @Override
14     public int CalcRent(int day) {
15         
16         return 0;
17     }
18     //重载方法
19     public int CalcRent(int day,int tonnage){
20         num=tonnage*day*50;
21         System.out.println("费用为"+num);
22         return num;
23     }
24     
25 
26 }

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: