Java入门第二季项目实战——答答租车

定义Car类：

package com.imooc.mika.dadarent;

public class Car {
    private String carName;
    private double price;

    public Car(String carName, double price) {
 this.carName = carName;
 this.price = price;
    }

    public String getCarName() {
 return carName;
    }

    public void setCarName(String carName) {
 this.carName = carName;
    }

    public double getPrice() {
 return price;
    }

    public void setPrice(double price) {
 this.price = price;
    }

    @Override
    public String toString() {
 return carName + "t" + price;
    }

}

创建3个继承Car的子类：
客车BusCar ：

package com.imooc.mika.dadarent;

public class BusCar extends Car {

    private int busLoad;

    public BusCar(String carName, double price) {
 super(carName, price);
    }

    public BusCar(String carName, int busLoad, double price) {
 super(carName, price);

 this.busLoad = busLoad;
    }

    public int getBusLoad() {
 return busLoad;
    }

    public void setBusLoad(int busLoad) {
 this.busLoad = busLoad;
    }

    @Override
    public String toString() {
 return super.toString() + "t" + busLoad + "t-";
    }
}

货车TrunkCar ：

package com.imooc.mika.dadarent;

public class TrunkCar extends Car {

    private double deadWeight;

    public TrunkCar(String carName, double price) {
 super(carName, price);
    }

    public TrunkCar(String carName, double deadWeight, double price) {
 super(carName, price);
 this.deadWeight = deadWeight;
    }

    public double getDeadWeight() {
 return deadWeight;
    }

    public void setDeadWeight(double deadWeight) {
 this.deadWeight = deadWeight;
    }
    @Override
    public String toString() {
 return super.toString() + "t-t" + deadWeight;
    }
}

客货两用PickUpCar ：

package com.imooc.mika.dadarent;

public class PickUpCar extends Car {

    private int busLoad;
    private double deadWeight;

    public PickUpCar(String carName, double price) {
 super(carName, price);
    }

    public PickUpCar(String carName, int busLoad, double deadWeight, double price) {
 super(carName, price);
 this.busLoad = busLoad;
 this.deadWeight = deadWeight;
    }

    public int getBusLoad() {
 return busLoad;
    }

    public void setBusLoad(int busLoad) {
 this.busLoad = busLoad;
    }

    public double getDeadWeight() {
 return deadWeight;
    }

    public void setDeadWeight(double deadWeight) {
 this.deadWeight = deadWeight;
    }

    @Override
    public String toString() {
 return super.toString() + "t" + busLoad + "t" + deadWeight;
    }

}

主程序：

package com.imooc.mika.dadarent;

import java.util.HashSet;
import java.util.Scanner;

public class DaDaRent {
    private static Scanner sn = new Scanner(System.in);

    public static void main(String[] args) {

 System.out.println("欢迎使用答答租车系统！");
 boolean quit = false;

 while (!quit) {
     System.out.println("租车请输入数字'1'，退出系统请输入数字'0'");

     switch (inputCommand()) {
     case 0:
  quit = true;
  break;
     case 1:
  rentCars();
  break;
     default:
  System.out.println("命令输入错误！请根据提示输入命令值！");
  break;
     }
 }

 sn.close();
 System.out.println("退出系统~");
    }

    private static void rentCars() {
 // 可选车型初始化
 Car[] carList = initCarList();
 // 打印可选车型信息
 printCarList(carList);
 // 输入租车数量
 int rentCount = setRentCount();
 // 选择具体车型
 Car[] selectCars = selectCars(carList, rentCount);
 // 输入租车天数
 int days = setRentDays();
 // 打印账单
 printBill(selectCars, days);
    }

    private static Car[] initCarList() {
 Car[] carList = new Car[5];
 carList[0] = new TrunkCar("货车1号", 5, 500);
 carList[1] = new TrunkCar("货车2号", 10, 800);
 carList[2] = new BusCar("客车1号", 4, 400);
 carList[3] = new BusCar("客车2号", 20, 1500);
 carList[4] = new PickUpCar("客货两用", 4, 8, 1000);
 return carList;
    }

    private static void printCarList(Car[] carList) {

 System.out.println("可选车型一览表：");
 System.out.println("编号t车型t日租金(元)t载客量(人)t载重量(吨)");

 for (int i = 0; i < carList.length; i++) {
     System.out.println((i + 1) + "t" + carList[i].toString());
 }
    }

    private static int setRentCount() {
 int rentCount = 0;
 do {
     System.out.println("请输入租车数量(1-100)：");
     rentCount = inputCommand();
 } while (!(rentCount > 0 && rentCount <= 100));
 return rentCount;
    }

    private static Car[] selectCars(Car[] carList, int rentCount) {

 System.out.println("请输入每辆车辆的编号：");
 Car[] selectCars = new Car[rentCount];
 int carNo = 0;
 for (int i = 0; i < rentCount; i++) {

     do {
  System.out.println("第" + (i + 1) + "辆车的编号(1-" + carList.length + ")：");
  carNo = inputCommand();
     } while (!(carNo > 0 && carNo <= carList.length));

     selectCars[i] = carList[carNo - 1];
 }

 return selectCars;
    }

    private static int setRentDays() {
 int days = 0;
 do {
     System.out.println("请输入租车的天数(1-365)：");
     days = inputCommand();
 } while (!(days > 0 && days <= 365));
 return days;
    }

    private static void printBill(Car[] selectCars, int days) {

 System.out.println("账单：————————————————————————");
 System.out.println("租用车辆数量：" + selectCars.length);
 System.out.println("租用天数：" + days);

 // 计算选择车辆的总载客数、载重量、总租用金额、车型名称
 HashSet carNames = new HashSet();
 int sumBusLoad = 0;
 double sumDeadWeight = 0;
 double sumPrice = 0;

 for (Car car : selectCars) {

     carNames.add(car.getCarName());

     sumPrice += car.getPrice();

     if (car instanceof BusCar)
  sumBusLoad += ((BusCar) car).getBusLoad();

     if (car instanceof TrunkCar)
  sumDeadWeight += ((TrunkCar) car).getDeadWeight();

     if (car instanceof PickUpCar) {
  sumBusLoad += ((PickUpCar) car).getBusLoad();
  sumDeadWeight += ((PickUpCar) car).getDeadWeight();
     }
 }

 System.out.println("总载客数(人)：" + sumBusLoad);
 System.out.println("总载重量(吨)：" + sumDeadWeight);
 System.out.println("总租用金额(元)：" + sumPrice * days);
 System.out.println("租用车辆型号：" + carNames.toString());
 System.out.println("————————————————————————————");
    }

    private static int inputCommand() {
 try {
     return sn.nextInt();
 } catch (Exception e) {
     sn = new Scanner(System.in);
     return -1;
 }
    }
}