17、Java——汽车租赁系统（对象+数组）

目录

​​项目需求​​

​​设计步骤 ​​

​​类的属性和方法​​

​​代码展示​​

​​效果展示​​

项目需求

        某汽车租赁公司出租多种轿车和客车，出租费用以日为单位计算。

        出租车型及信息如下表所示：

设计步骤 

类的属性和方法

属性：

• 汽车类：车牌号、品牌、日租金
• 客车类：车牌号、品牌、日租金、座位数
• 轿车类：车牌号、品牌、日租金、型号
• 汽车业务类：忽略
• 汽车租赁管理类：忽略

方法： 

代码展示

 1、汽车类（父类）

package cn.bdqn.demo06;

public abstract class Automobile {
  
  // 定义汽车类的属性（车牌号、品牌、日租金）
  private String numberPlate;
  private String brand;
  private double dayRent;

  public Automobile() {
    super();
  }

  public Automobile(String numberPlate, String brand, double dayRent) {
    super();
    this.numberPlate = numberPlate;
    this.brand = brand;
    this.dayRent = dayRent;
  }

  public String getNumberPlate() {
    return numberPlate;
  }

  public void setNumberPlate(String numberPlate) {
    this.numberPlate = numberPlate;
  }

  public String getBrand() {
    return brand;
  }

  public void setBrand(String brand) {
    this.brand = brand;
  }

  public double getDayRent() {
    return dayRent;
  }

  public void setDayRent(double dayRent) {
    this.dayRent = dayRent;
  }
  
  //定义计算租金的抽象方法
  public abstract double calRent(int days);
}

2、轿车类（子类）

package cn.bdqn.demo06;

public class Car extends Automobile {

  // 定义特有属性
  private String type;

  public Car() {
    super();
  }

  public Car(String numberPlate, String brand, double dayRent, String type) {
    super(numberPlate, brand, dayRent);
    this.type = type;
  }
  
  public String getType() {
    return type;
  }

  public void setType(String type) {
    this.type = type;
  }

  @Override
  public double calRent(int days) {
    double discount=this.getDayRent()*days;
    if(days>150){
      discount*=0.7;
    }else if(days>30){
      discount*=0.8;
    }else if(days>7){
      discount*=0.9;
    }
    return discount;
  }

}

3、客车类（子类）

package cn.bdqn.demo06;

public class Bus extends Automobile {

  private int seat;
  
  public Bus() {
    super();
  }

  public Bus(String numberPlate, String brand, double dayRent, int seat) {
    super(numberPlate, brand, dayRent);
    this.seat = seat;
  }

  public int getSeat() {
    return seat;
  }

  public void setSeat(int seat) {
    this.seat = seat;
  }

  @Override
  public double calRent(int days) {
    double discount=this.getDayRent()*days;
    if(days>150){
      discount*=0.6;
    }else if(days>30){
      discount*=0.7;
    }else if(days>7){
      discount*=0.8;
    }else if(days>3){
      discount*=0.9;
    }
    return discount;
  }

}

4、汽车业务类

package cn.bdqn.demo06;

//汽车业务类
public class AutomobileMethod {
  //汽车类型的数组
  Automobile[] automobiles=new Automobile[8];
  
  //初始化数据
  public void initData(){
    automobiles[0]=new Car("京NY28588", "宝马", 800, "X6");
    automobiles[1]=new Car("京CNY3284", "宝马", 600, "550i");
    automobiles[2]=new Car("京NT37465", "别克", 300, "林荫大道");
    automobiles[3]=new Car("京NT96968", "别克", 600, "GL8");
    automobiles[4]=new Bus("京6566754", "金杯", 800, 16);
    automobiles[5]=new Bus("京8696997", "金龙", 800, 16);
    automobiles[6]=new Bus("京9696996", "金杯", 1500, 34);
    automobiles[7]=new Bus("京8696998", "金龙", 1500, 34);
  }
  
  //租车
  public Automobile autoMethod(String brand,String type,int seat){
    Automobile auto=null;
    for (Automobile autobile : automobiles) {
      if(autobile instanceof Car){
        Car car=(Car)autobile;
        if(car.getBrand().equals(brand)&&car.getType().equals(type)){
          auto=car;
          break;
        }
      }else if(autobile instanceof Bus){
        Bus bus=(Bus)autobile;
        if(bus.getBrand().equals(brand)&&bus.getSeat()==seat){
          auto=bus;
          break;
        }
      }
    }
    return auto;
  }
}

5、租车测试类

package cn.bdqn.demo06;

import java.util.Scanner;

//测试类
public class AutomobileLease {

  public static void main(String[] args) {
    
    Scanner sc=new Scanner(System.in);
    String brand=null,type=null;
    int seat=0;
    AutomobileMethod autoM=new AutomobileMethod();
    //获取所有车辆信息
    autoM.initData();
    System.out.println("********欢迎光临租赁公司********\n");
    System.out.println("请选择汽车类型：1、轿车\t2、客车");
    int autoType=sc.nextInt();
    
    if(autoType==1){
      System.out.println("请选择轿车品牌：1、宝马\t2、别克");
      if(sc.nextInt()==1){
        brand="宝马";
        System.out.println("请选择轿车型号：1、X6\t2、550i");
        type=(sc.nextInt()==1)?"X6":"550i";
        
      }else if(sc.nextInt()==2){
        brand="别克";
        System.out.println("请选择轿车型号：1、林荫大道\t2、GL8");
        type=(sc.nextInt()==1)?"林荫大道":"GL8";
      }
    }else if(autoType==2){
      System.out.println("请选择客车品牌：1、金杯\t2、金龙");
      brand=(sc.nextInt()==1)?"金杯":"金龙";
      System.out.println("请选择需要的座位数：1、16座\t2、34座");
      type=(sc.nextInt()==1)?"16":"34";
    }
    Automobile auto= autoM.autoMethod(brand, type, seat);
    System.out.println("请选择租赁天数：");
    int days=sc.nextInt();
    double money=auto.calRent(days);
    
    System.out.println("租车成功！请按照"+auto.getNumberPlate()+"车牌号取车！租金为："+money);
  }
}

效果展示