Java入门第二季6.1 达达租车系统源代码 欢迎交流

建立数据包，建立Car父类，编辑构造方法，编辑getinfo方法
package daDaZuCheXiTong;

public class Car {
String name;
int id;
int rent;
int seat;
int capacity;
public Car(int id, String name,int rent, int seat, int capacity){
this.id = id;
this.name = name;
this.rent = rent;
this.seat = seat;
this.capacity = capacity;
}
public String getinfo(){
return id + ".\t" + name + "\t" + seat + "\t" + capacity + "\t" + rent;
}
}
建立Sedan子类和Truck子类，继承Car父类，利用super关键字调用父类构造方法，不需要赋值的变量赋值为零，重写getinfo方法，不需要显示的变量值设置返回值为N/A。
package daDaZuCheXiTong;

public class Sedan extends Car {

public Sedan(int id,String name,int rent, int seat){
super(id, name, rent, seat, 0);
}

public String getinfo(){
return id + ".\t" + name + "\t" + seat + "\t" + "N/A" + "\t" + rent;
}
}

package daDaZuCheXiTong;

public class Truck extends Car {

public Truck(int id,String name,int rent, int capacity){
super(id, name, rent, 0, capacity);
}

public String getinfo(){
return id + ".\t" + name + "\t" + "N/A" + "\t" + capacity + "\t" + rent;
}
}

编写主方法，导入Scanner数据包，利用try catch finally结构，在try里面利用switch case循环编写程序主体，如果在主体中出现问题，利用catch语句记录异常，最后在finally语句中close掉输入变量
package daDaZuCheXiTong;

import java.util.Scanner;

public class XiTong {

public static void main(String[] args) {
    int totalSeat = 0;
    int totalCapacity = 0;
    int totalRent = 0;
    int choose = 0;
    String truckStr = "";
    String SedanList = "";
    Scanner input1 = null;
    Scanner input2 = null;
    Scanner input3 = null;
    Scanner input4 = null;
    Car[] car = { new Sedan(1, "奥迪A6", 500, 4),
                  new Sedan(2, "马自达6", 400, 4), 
                  new Sedan(3, "雪铁龙", 450, 4),
                  new Sedan(4, "荣威RX5", 500, 4), 
                  new Sedan(5, "金江大客", 8000, 20),
                  new Truck(6, "松花江", 4000, 4) };
    System.out.println("欢迎使用达达租车系统！");
    System.out.println("请问你是否要继续 ？         1：继续        2：不继续");
    try {
        input1 = new Scanner(System.in);
        input2 = new Scanner(System.in);
        input3 = new Scanner(System.in);
        input4 = new Scanner(System.in);
        choose = input1.nextInt();
        switch (choose) {
        case 1:
            System.out.println("您可选择的车型为：");
            System.out.println("序号\t汽车名称\t载人(人)\t载货(吨)\t租金(元/天)\t");
            for (Car a : car) {
                System.out.println(a.getinfo());
            }
            System.out.println("请输入你想租赁车的数量：");
            int carNum = input2.nextInt();
            int[] carDay = new int[carNum];
            for (int i = 0; i < carNum;) {
                System.out.println("请输入您想租赁的第" + (i + 1) + "辆车的序号");
                int carId = input3.nextInt();
                if (carId < 1 || carId > 6) {
                    System.out.println("您输入的序号有误，请重新输入!");
                    continue;
                }
                System.out.println("请输入你想租这辆车的天数");
                carDay[i] = input4.nextInt();
                totalSeat += car[(carId - 1)].seat;
                totalCapacity += car[(carId - 1)].capacity;
                totalRent += (car[(carId - 1)].rent) * carDay[i];
                if (car[(carId - 1)].capacity != 0) {
                    truckStr = truckStr + car[(carId - 1)].name + ": "
                            + carDay[i] + " " + "天"+"   ";
                }
                if (car[(carId - 1)].seat != 0) {
                    SedanList = SedanList + car[(carId - 1)].name + ": "
                            + carDay[i] + " " + "天"+"   ";
                }
                i++;
            }
            System.out.println("您的账单如下：");
            if (truckStr == "") {
                System.out.println("您没有租赁可以载货的车辆");
            } else {
                System.out.println("您租赁的可载货的车辆以及天数为：" + truckStr);
                System.out.println("总载货量：" + totalCapacity + "吨"+"  ");
            }
            if (SedanList == "") {
                System.out.println("您没有租赁可以载人的车辆");
            } else {
                System.out.println("您租赁的可载人的车辆以及天数为：" + SedanList);
                System.out.println("总载人数：" + totalSeat + "人"+"   ");
            }
            if (totalRent != 0) {
                System.out.println("您租赁车辆的总价格为" + totalRent + "元");
            } else {
                System.out.println("感谢您的使用！");
            }
            break;
        case 2:
            System.out.println("感谢您的使用！");
            break;

        default: {
            System.out.println("您输入的信息有误");
            break;
        }
        }
    } 
    catch (Exception e) {
        e.printStackTrace();
    } 
    finally {
        if (input1 != null) {
            input1.close();
        }
        if (input2 != null) {
            input2.close();
        }
        if (input3 != null) {
            input3.close();
        }
        if (input4 != null) {
            input4.close();
        }
    }
}

}