Java代码~~汽车租赁系统

租车信息：

输出结果：

代码：

1、先定义抽象类（汽车类：Moto）

 package cn.aura.demo01;

 public abstract class Moto {
     //公共属性
     private String id;//车牌号
     private String brand;//品牌
     private int preRent;//日租金
     //构造方法
     public Moto(String id, String brand, int preRent) {
         this.id = id;
         this.brand = brand;
         this.preRent = preRent;
     }
     //set和get方法
     public String getId() {
         return id;
     }
     public void setId(String id) {
         this.id = id;
     }
     public String getBrand() {
         return brand;
     }
     public void setBrand(String brand) {
         this.brand = brand;
     }
     public int getPreRent() {
         return preRent;
     }
     public void setPreRent(int preRent) {
         this.preRent = preRent;
     }
     //计算租金方法
     public abstract double  calRent(int days);
 }

2.定义轿车类继承汽车类

 package cn.aura.demo01;
 /**
  * 轿车类
  */
 public class Car extends Moto{
     //私有属性
     private String type;//型号
     //set和get方法
     public String getType() {
         return type;
     }
     public void setType(String type) {
         this.type = type;
     }
     //构造方法
     public Car(String id, String brand, String type,int preRent) {
         super(id, brand, preRent);
         this.type = type;
     }

     //重写计算租金的算法
     @Override
     public double calRent(int days) {
         if(days >0 && days <= 7) {
             //days小于7天，不打折
             return getPreRent()*days;
         }else if (days > 7 && days <= 30) {
             //days大于7天，9折
             return getPreRent()*days*0.9;
         }else if (days > 30 && days <= 150) {
             //days大于30天，8折
             return getPreRent()*days*0.8;
         }else if (days > 150) {
             //days大于150天，7折
             return getPreRent()*days*0.7;
         }
         return 0;
     }
 }

3.定义客车类

 package cn.aura.demo01;
 /**
  * 客车类
  */
 public class Bus extends Moto{
     //私有属性
     private int seatCount;//座位数
     //set和get方法
     public int getSeatCount() {
         return seatCount;
     }
     public void setSeatCount(int seatCount) {
         this.seatCount = seatCount;
     }
     //构造方法
     public Bus(String id, String brand, int seatCount, int preRent) {
         super(id, brand, preRent);
         this.seatCount = seatCount;
     }
     //重写计算租金的算法
     @Override
     public double calRent(int days) {
         if(days >0 && days <3) {
             //days小于3天，不打折
             return getPreRent()*days;
         }else if (days >= 3 && days < 7) {
             //days大于3天，9折
             return getPreRent()*days*0.9;
         }else if (days >= 7 && days <30) {
             //days大于3天，8折
             return getPreRent()*days*0.8;
         }else if (days >= 30 && days <150) {
             //days大于30天，7折
             return getPreRent()*days*0.7;
         }else if (days >= 150) {
             //days大于150天，6折
             return getPreRent()*days*0.6;
         }
         return 0;
     }
 }

4.定义汽车业务类

 package cn.aura.demo01;
 /**
  * 定义汽车业务类
  */
 public class MotoOperation {
     //初始化数组
     public static Moto[] motos = new Moto[8];
     //创建8个汽车对象
     public  void init() {
         motos[0] = new Car("京NY28558", "宝马", "X6", 800);
         motos[1] = new Car("京CNY3284", "宝马", "550i", 600);
         motos[2] = new Car("京NT37465", "别克", "林荫大道", 300);
         motos[3] = new Car("京NT96968", "别克", "GL8", 600);
         motos[4] = new Bus("京6566754", "金杯", 16, 800);
         motos[5] = new Bus("京8696997", "金龙", 16, 800);
         motos[6] = new Bus("京9696996", "金杯", 34, 1500);
         motos[7] = new Bus("京8696998", "金龙", 34, 1500);
     }
     //租赁汽车的方法
     public  Moto motoLeaseOut(String brand,String type,int seat) {
          //for循环遍历数组motos
          for(int i=0;i<motos.length;i++){
              if (brand.equals(motos[i].getBrand())) {
                 // 判断Moto类的motos[i]的类型是否和Car一样
                 if (motos[i] instanceof Car) {
                     // 强转成小汽车Car
                     Car car = (Car) motos[i];
                     if (type.equals(car.getType())) {
                         return car;
                     }
                 }
                 if(motos[i] instanceof Bus){
                     // 强转成大客车Bus
                     Bus bus = (Bus) motos[i];
                     if (seat == bus.getSeatCount()) {
                         return bus;
                     }
                 }
             }

          }
          //如果没有就返回空
          return null;
     }
 }

5.定义测试类

 package cn.aura.demo01;

 import java.util.Scanner;

 /**
  * 汽车租赁管理类
  */
 public class TestRent {
     //主函数
     public static void main(String[] args) {
         MotoOperation motoOperation = new MotoOperation();
         // 初始化汽车
         motoOperation.init();
         //设置一个空容器
         Moto moto = null;
         // 提示信息
         System.out.println("***********欢迎光临腾飞汽车租赁公司***********");
         System.out.println("1、轿车           2、客车");
         System.out.println("请输入你要租赁的汽车类型：");
         // 获取用户输入
         Scanner scanner = new Scanner(System.in);
         int flag = scanner.nextInt();
         if (flag == 1) {
             //轿车
             System.out.println("请选择你要租赁的汽车品牌：1、别克   2、宝马");
             int brand = scanner.nextInt();
             if (brand == 1) {
                 System.out.println("请选择你要租赁的汽车类型：1、林荫大道  2、GL8");
                 int type = scanner.nextInt();
                 if (type == 1) {
                     moto = motoOperation.motoLeaseOut("别克", "林荫大道", 4);
                 } else if (type == 2) {
                     moto = motoOperation.motoLeaseOut("别克", "GL8", 4);
                 }
             } else if (brand == 2) {
                 System.out.println("请选择你要租赁的汽车类型：1、X6  2、550i");
                 int type = scanner.nextInt();
                 if (type == 1) {
                     moto = motoOperation.motoLeaseOut("宝马", "X6", 4);
                 } else if (type == 2) {
                     moto = motoOperation.motoLeaseOut("别克", "550i", 4);
                 }
             }
         } else if (flag == 2) {
             //客车
             System.out.println("请选择你要租赁的汽车品牌：1、金龙   2、金杯");
             int brand = scanner.nextInt();
             if (brand == 1) {
                 System.out.println("请选择你要租赁的汽车座位数：1、16座  2、34座");
                 int type = scanner.nextInt();
                 if (type == 1) {
                     moto = motoOperation.motoLeaseOut("金龙", "", 16);
                 } else if (type == 2) {
                     moto = motoOperation.motoLeaseOut("金龙", "", 34);
                 }
             } else if (brand == 2) {
                 System.out.println("请选择你要租赁的汽车座位数：1、16座  2、34座");
                 int type = scanner.nextInt();
                 if (type == 1) {
                     moto = motoOperation.motoLeaseOut("金杯", "", 16);
                 } else if (type == 2) {
                     moto = motoOperation.motoLeaseOut("金杯", "", 34);
                 }
             }
         }
         //客户汽车匹配完成
         if (moto != null) {
             // 获取用户租车天数
             System.out.println("请输入您的租车天数：");
             int days = scanner.nextInt();
             // 计算租车钱
             double money = moto.calRent(days);
             System.out.println("分配给您的汽车牌号是：" + moto.getId());
             System.out.println("您需要支付的租赁费用是：" + money + "元");
         }else {
             System.out.println("很抱歉先生：当前的公司内，暂无您要的汽车类型！请重新选择！");
         }

     }

 }