练习

运行效果

代码car.java：`
package com.xt.car;

public abstract class Car {

private String name;
private int price;

public Car(String name, int price) {
    super();
    this.name = name;
    this.price = price;
}

public abstract String getCapacity();

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;
}

}
PassengerCar.javapackage com.xt.car;

import com.xt.car.Interface.IMen;

public class PassengerCar extends Car implements IMen {

private int seat;

public PassengerCar(String name, int price, int seatCount) {
    super(name, price);
    seat = seatCount;
}

public void setSeatCount(int count) {
    seat = count;
}

public int getSeatCount() {
    return seat;
}

public String getCapacity() {

    return "载人：" + seat + "人";
}

}
TruckCar.javapackage com.xt.car;

import com.xt.car.Interface.IGoods;

public class TruckCar extends Car implements IGoods{

private int weight;

public TruckCar(String name, int price, int weight) {
    super(name, price);
    this.weight = weight;
    }

public int getGoodsWeight() {
    return weight;
}

public void setGoodsWeight(int weight) {
    this.weight = weight;
}

public String getCapacity() {
    return "载重：" + weight + "吨";
    }

}
pikCar.javapackage com.xt.car;

import com.xt.car.Interface.IGoods;
import com.xt.car.Interface.IMen;

public class pikCar extends Car implements IGoods,IMen{

private int count;
private int weight;
public pikCar(String name, int price, int count, int weight) {
    super(name, price);
    this.count = count;
    this.weight = weight;
}

public void setSeatCount(int count) {
    this.count = count;
}

public int getSeatCount() {
    return count;
}

public int getGoodsWeight() {
    return weight;
}

public void setGoodsWeight(int weight) {
    this.weight = weight;
}

public String getCapacity() {
    return "载人：" + count + "人，载重：" + weight + "吨";
}

}
IGoods.javapackage com.xt.car.Interface;

public interface IGoods {
public int getGoodsWeight();
public void setGoodsWeight(int weight);

}
`
IMen.java

package com.xt.car.Interface;

public interface IMen {
    public void setSeatCount(int count);
    public int getSeatCount();

}

Init.java

package com.xt.car;

import java.util.Scanner;

import com.xt.car.Interface.IGoods;
import com.xt.car.Interface.IMen;

public class Init {

    public static final Car[] CARS = { new PassengerCar("奥迪A4", 500, 4),
            new PassengerCar("马自达6", 400, 4), new pikCar("皮卡雪6", 450, 4, 2),
            new PassengerCar("金龙", 800, 20), new TruckCar("松花江", 400, 4),
            new TruckCar("依维柯", 1000, 20)

    };
    static int choose[] = new int[100];
    static int[] no = new int[100];
    static int[] days = new int[100];
    static int count = 0;

    public static void main(String[] args) {

        showlist();
        choosecar();

    }

    private static void showresult() {
        System.out.println("您选租的车辆信息如下：");
        int totleprice = 0;
        int man = 0;
        int weight = 0;
        for (int i = 0; i < count; i++) {
            int price = (CARS[choose[i]-1]).getPrice() * no[i] * days[i];
            if (CARS[choose[i]-1] instanceof IMen) {
                man = ((IMen) CARS[choose[i]-1]).getSeatCount();
            }
            if (CARS[choose[i]-1] instanceof IGoods) {
                weight = ((IGoods) CARS[choose[i]-1]).getGoodsWeight();
            }
            System.out.printf("%s\t%d辆\t%d天\t载客量%d人 \t载货量%d吨\t单价%d元/辆/天\t总价%d%n",
                    CARS[choose[i]-1].getName(), no[i], days[i], man, weight,
                    CARS[choose[i]-1].getPrice(),price);
            totleprice += price;

        }
        System.out.println("您选租的车辆总价格：" + totleprice + "元");
    }

    public static void choosecar() {
        System.out.println("欢迎使用答答租车系统!");
        for (int i = 0;; i++) {
            Scanner scanner = new Scanner(System.in);
            System.out.println("您是否继续租车：1是；0否");
            int yesOrNo = scanner.nextInt();
            if (yesOrNo == 1) {
                System.out.println("请输入您要租车型的序号:");
                while (true) {
                    choose[i] = scanner.nextInt();
                    if (1 > choose[i]||choose[i] > 6) {
                        showlist();
                        System.out.println("选择错误，请重新选择！");
                    } else {
                        System.out.printf("请输入您要租%d号车型的数量:%n", choose[i]);

                        no[i] = scanner.nextInt();
                        System.out.printf("请输入您要租%d号车型的天数:%n", choose[i]);
                        days[i] = scanner.nextInt();
                        count++;
                        System.out.println("选择完成！");
                        break;
                    }
                }
            } else if (yesOrNo == 0){
                if (count == 0) {
                    System.out.println("未选择车辆，退出!");
                    break;
                } else{
                    System.out.println("选择车辆完成！");
                    showresult();
                    break;
                }
            }else {
                System.out.println("输入错误！请重新输入");
            }
        }
    }

    public static void showlist() {
        System.out.println("您可租车的类型及其价目表:");
        System.out.println("序号\t 汽车名称\t 租金\t\t 容量");
        for (int i = 0; i < CARS.length; i++) {
            System.out.printf("%d\t %s\t %d元/天\t %s%n", (i + 1),
                    CARS[i].getName(), CARS[i].getPrice(),
                    CARS[i].getCapacity());

        }
    }
}