嗒嗒租车系统

很粗糙的成品，很多细节都没有处理，懒得弄了。正确操作的前提没什么问题，少了一些输入不合理信息时的报错提示。强行使用了接口，弄得有点晕哈哈。

父类抽象类：

package dada;

public abstract class Car {
    private int id;
    private String name;
    private int price;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }

}

两个接口：

package dada;

public interface ICapacity {
    void setCapacity(int cap);
    int getCapacity();
}

package dada;

public interface ICargoVolume {
    void setCargoVolume(int vol);
    int getCargoVolume();

}

分别三个子类：

package dada;

public class PassengerCar extends Car implements ICapacity {
    private int cap;

    public PassengerCar(int id,String name,int price,int cap){
        this.setId(id);
        this.setName(name);
        this.setPrice(price);
        this.setCapacity(cap);
        //客车类的属性
    }

    @Override
    public void setCapacity(int cap) {
        // TODO Auto-generated method stub
        this.cap=cap;
    }

    @Override
    public int getCapacity() {
        // TODO Auto-generated method stub
        return cap;
    }

}

package dada;

public class Pickup extends Car implements ICapacity,ICargoVolume {
    private int cap;
    private int vol;
    public Pickup(int id,String name,int price,int cap,int vol){
        this.setId(id);
        this.setName(name);
        this.setPrice(price);
        this.cap=cap;
        this.vol=vol;
        //皮卡类的属性
    }
    public int getCapacity() {
        return cap;
    }
    public void setCapacity(int cap) {
        this.cap = cap;
    }
    public int getCargoVolume() {
        return vol;
    }
    public void setCargoVolume(int vol) {
        this.vol = vol;
    }

}

package dada;

public class Truck extends Car implements ICargoVolume {
    private int vol;//载货量
    public Truck(int id,String name,int price,int vol){
        this.setId(id);
        this.setName(name);
        this.setPrice(price);
        this.vol=vol;
    }
    public int getCargoVolume() {
        return vol;
    }
    public void setCargoVolume(int vol) {
        this.vol = vol;
    }

}

运行：

package dada;
import java.util.Scanner;
public class Test {
    public static final Car[] cars={
            new PassengerCar(1,"奥迪A4",500,4),
            new PassengerCar(2,"马自达6",400,4),
            new Pickup(3,"皮卡雪6",450,4,2),
            new PassengerCar(4,"金龙",800,20),
            new Truck(5,"松花江",400,4),
            new Truck(6,"依维柯",1000,20)
    };

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("欢迎使用dada租车系统！"+"\n"+"您是否要租车：1.是"+"\t"+"0.退出");
        Scanner s = new Scanner(System.in);
        int input = s.nextInt();
        if(input ==1){
            System.out.println("可供租用的车辆及其价目表：");
            System.out.println("序号"+"\t"+"车型"+"\t"+"租金"+"\t"+"容量");
            for(Car car:cars){
                if(car.getClass().equals(PassengerCar.class)){
                    //判断该车是否是客车的实例
                    //使用getCapacity的时候需要将car强制转换成PassengerCar类型！
                    System.out.println(car.getId()+"\t"+car.getName()+"\t"+car.getPrice()+"/天"+"\t"+((PassengerCar)car).getCapacity()+"人");
                }else if(car.getClass().equals(Truck.class)){
                    System.out.println(car.getId()+"\t"+car.getName()+"\t"+car.getPrice()+"/天"+"\t"+((Truck)car).getCargoVolume()+"吨");
                }else{
                    System.out.println(car.getId()+"\t"+car.getName()+"\t"+car.getPrice()+"/天"+"\t"+((Pickup)car).getCapacity()+"人"+((Pickup)car).getCargoVolume()+"吨");
                }
            }
        }else{
            System.out.println("感谢使用dada租车系统！");
        }
        System.out.println("请输入您要租车的数量：");
        int count = s.nextInt();
        Car rent[] = new Car[count];
        for(int i=0; i<count;i++){
            System.out.println("请输入第"+(i+1)+"辆车的序号");
            int num = s.nextInt();
            rent[i]=cars[num-1];
        }
        System.out.println("请输入租车的天数：");
        int days  = s.nextInt();
        int sum = 0;
        for(Car car: rent){
            System.out.println(car.getName());
        }
        System.out.println("以下是您本次的租车信息及账单：");
        System.out.println("您本次共租用"+count+"辆车：");
        for(int i= 0;i<rent.length;i++){
            if(rent[i]!=null){
                System.out.println(rent[i].getName());
            }else{

            }
            sum += rent[i].getPrice()*days;
        }
        System.out.println("您本次需支付："+sum+"元");
        s.close();
    }
}

运行结果：