Java Parking System Implementation with User and Admin Management

This article describes a complete Java parking system project, covering functional requirements such as viewing available slots, random slot assignment, fee calculation (free for up to 3 hours, hourly charge thereafter up to a maximum), user and admin operations, and historical record viewing.

The system consists of several layers: a client console interface, entity classes for Admin, User, and CarParking, service interfaces defining business operations, and concrete service implementations handling the core logic.

package com.gem.client; import java.util.Scanner; import com.gem.entity.Admin; import com.gem.entity.User; import com.gem.service.impl.AdminServiceImpl; import com.gem.service.impl.CarParkingServiceimpl; import com.gem.service.impl.UserServiceimpl; public class Client { public static void main(String[] args) { CarParkingServiceimpl carparkingservice = CarParkingServiceimpl.getCarparkingservice(); UserServiceimpl userserviceimpl = UserServiceimpl.getUserserviceimpl(); Scanner scanner = new Scanner(System.in); Menu1(carparkingservice, userserviceimpl, scanner); } private static void Menu1(CarParkingServiceimpl carparkingservice, UserServiceimpl userserviceimpl, Scanner scanner) { while (true) { System.out.println("****欢迎进入停车系统****"); System.out.println("***1.请输入您的车牌***"); System.out.println("***2.管理员***"); System.out.println("***3.退出****"); int choice = Integer.parseInt(scanner.nextLine().trim()); switch (choice) { case 1: System.out.println("请输入您的车牌"); String chepai = scanner.nextLine().trim(); User a = userserviceimpl.login(new User(chepai)); if (a != null) { System.out.println("车牌登记成功"); Menu2(carparkingservice, userserviceimpl, scanner, a); } else { System.out.println("车牌登记失败"); } break; case 2: Menu_Manger(carparkingservice, userserviceimpl); break; default: break; } } } //管理员的登录注册 private static void Menu_Manger(CarParkingServiceimpl carparkingservice, UserServiceimpl userserviceimpl) { AdminServiceImpl adminserviceimpl = AdminServiceImpl.getAdminSeriver(); while (true) { System.out.println("1.管理员登录"); System.out.println("2.管理员注册"); System.out.println("返回上一级"); Scanner scanner = new Scanner(System.in); int chose = Integer.parseInt(scanner.nextLine().trim()); switch (chose) { case 1: System.out.println("请输入管理员账号"); String name = scanner.nextLine().trim(); System.out.println("请输入管理员密码"); String password = scanner.nextLine().trim(); if (adminserviceimpl.login(name, password) != null) { System.out.println("登录成功"); Menu_Manger2(carparkingservice, userserviceimpl, adminserviceimpl); } else { System.out.println("登录失败"); return; } break; case 2: System.out.println("请输入注册账号"); name = scanner.nextLine().trim(); System.out.println("请输入注册密码"); password = scanner.nextLine().trim(); adminserviceimpl.register(new Admin(name, password)); break; case 3: return; default: return; } } } //管理员操作 private static void Menu_Manger2(CarParkingServiceimpl carparkingservice, UserServiceimpl userserviceimpl, AdminServiceImpl adminserviceimpl) { while (true) { System.out.println("***欢迎进入管理员操作***"); System.out.println("1.查看现有停车位"); System.out.println("2.查看停车位上的车以及缴费"); System.out.println("3.返回上一级"); Scanner scanner = new Scanner(System.in); int chose = Integer.parseInt(scanner.nextLine().trim()); switch (chose) { case 1: carparkingservice.showlist(); break; case 2: carparkingservice.show(); break; case 3: return; default: System.out.println("输入错误"); break; } } } private static void Menu2(CarParkingServiceimpl carparkingservice, UserServiceimpl userserviceimpl, Scanner scanner, User a) { while (true) { System.out.println("欢迎车牌为:" + a.getCarid() + "车主请选择您要的服务"); System.out.println("1.停车"); System.out.println("2.离开并缴费"); System.out.println("3.查看停车车位"); System.out.println("4.停车时长"); System.out.println("0.返回上一级"); int chose = Integer.parseInt(scanner.nextLine().trim()); switch (chose) { case 1: if (carparkingservice.chack(a.getCarid())) { break; } while (true) { int random = (int) (Math.random() * 10); //随机一个车位 if (carparkingservice.parkcar(random, a.getCarid())) { System.out.println("停车成功,停车位置为:" + random); break; } else { System.out.println("当前车位有车"); } } break; case 2: if (carparkingservice.leavecar(a.getCarid())) { System.out.println("请缴费"); } else { System.out.println("该车未停"); } break; case 3: carparkingservice.showlist(); break; case 4: carparkingservice.showcartime(a.getCarid()); break; case 0: return; default: System.out.println("输入错误"); break; } } } }

package com.gem.entity; import java.util.ArrayList; import lombok.AllArgsConstructor; import lombok.Getter; import lombok.NoArgsConstructor; import lombok.Setter; @AllArgsConstructor @NoArgsConstructor @Getter @Setter public class Admin { private String username; private String password; private double money; private ArrayList list = new ArrayList<>(); @Override public String toString() { return username + "\t" + password; } public Admin(String username, String password) { this.username = username; this.password = password; } }

package com.gem.entity; import java.text.SimpleDateFormat; import java.util.Date; import lombok.AllArgsConstructor; import lombok.Getter; import lombok.NoArgsConstructor; @AllArgsConstructor @NoArgsConstructor @Getter public class CarParking { private int id; //停车的编号 private double money; //钱的计算 private String state; //当前停车状态 private Date stime; //停车时间 private Date etime; //停车结束 private static double allmoney; private static String lishi = ""; public void setStime() { //停车开始时间 stime = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); String time1 = dateFormat.format(this.stime); } public void setEtime() { //停车结束时间 etime = new Date(); SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); String time = dateFormat.format(this.etime); } @Override public String toString() { return id + "\t" + money + "\t" + stime; } public CarParking(int id, String state) { this.id = id; this.state = state; } // getters and setters omitted for brevity }

package com.gem.entity; import lombok.AllArgsConstructor; import lombok.Getter; import lombok.NoArgsConstructor; import lombok.Setter; @AllArgsConstructor @Setter @NoArgsConstructor @Getter public class User { private String carid; //车牌登录 @Override public String toString() { return "车牌为" + carid; } }

package com.gem.service; /* * 管理员业务接口 */ import com.gem.entity.Admin; public interface AdminService { //登录 Admin login(String username, String password); //注册 boolean register(Admin admin); }

package com.gem.service.impl; import java.util.ArrayList; import com.gem.entity.Admin; import com.gem.service.AdminService; public class AdminServiceImpl implements AdminService { private ArrayList adminList = new ArrayList<>(); //单例饿汉模式 private static final AdminServiceImpl adminSeriver = new AdminServiceImpl(); public static AdminServiceImpl getAdminSeriver() { return adminSeriver; } private AdminServiceImpl() {} @Override public Admin login(String username, String password) { for (Admin admin : adminList) { if (admin.getUsername().equals(username) && admin.getPassword().equals(password)) { return admin; } } return null; } @Override public boolean register(Admin admin) { return adminList.add(admin); } }

package com.gem.service; public interface CarParkingService { boolean parkcar(int id, String carid); //停车 void showlist(); //显示所有列表 boolean leavecar(String carid); //离开 }

package com.gem.service.impl; import java.util.ArrayList; import java.util.Date; import com.gem.entity.CarParking; import com.gem.service.CarParkingService; public class CarParkingServiceimpl implements CarParkingService { private ArrayList carpaking = new ArrayList<>(); { for (int i = 1; i <= 10; i++) { carpaking.add(new CarParking(i, "当前车位为空")); // 为10个车位赋予编号 和状态 } } private static CarParkingServiceimpl carparkingservice = new CarParkingServiceimpl(); public static CarParkingServiceimpl getCarparkingservice() { return carparkingservice; } @Override public boolean parkcar(int id, String carid) { for (CarParking car : carpaking) { if (id == car.getId() && car.getState().equals("当前车位为空")) { car.setState(carid); car.setStime(); return true; //停车成功 } } return false; //当前车位有车 } @Override public void showlist() { for (CarParking car : carpaking) { System.out.println(car.getId() + "\t" + car.getState()); } } public void showcartime(String carid) { for (CarParking car : carpaking) { if (car.getState().equals(carid)) { car.setEtime(); Date time1 = car.getEtime(); //得到当前的查询时间 Date time2 = car.getStime(); //得到开始时间 System.out.println("车位为:" + car.getId() + "车牌为" + car.getState()); System.out.println("停车时间为:" + car.getStime()); System.out.println("当前时间为:" + car.getEtime()); System.out.println("已经停车时间为:" + (time1.getTime() - time2.getTime()) / (1000 * 60 * 60)); } } } @Override public boolean leavecar(String carid) { for (CarParking car : carpaking) { if (car.getState().equals(carid)) { car.setEtime(); Date time1 = car.getEtime(); Date time2 = car.getStime(); long t = (time1.getTime() - time2.getTime()) / (1000 * 60 * 60); System.out.println("车位为:" + car.getId() + "车牌为" + car.getState()); System.out.println("停车时间为:" + car.getStime()); System.out.println("当前时间为:" + car.getEtime()); System.out.println("已经停车时间为:" + t); if (t <= 3) { car.setMoney(0); CarParking.setAllmoney(CarParking.getAllmoney() + car.getMoney()); } else if (t > 3 && t <= 13) { car.setMoney(2 * (t - 3)); CarParking.setAllmoney(CarParking.getAllmoney() + car.getMoney()); } else if (t > 13) { car.setMoney(20); CarParking.setAllmoney(CarParking.getAllmoney() + car.getMoney()); } car.setLishi(car.getLishi() + "车位:" + car.getId() + "收入金额为:" + car.getMoney() + "\n"); System.out.println("停车费为:" + car.getMoney()); car.setState("当前车位为空"); return true; } } return false; } public void show() { for (CarParking car : carpaking) { System.out.println(car.getLishi()); return; } } public boolean chack(String carid) { for (CarParking car : carpaking) { if (car.getState().equals(carid)) { System.out.println("车辆正在停使中"); return true; } } return false; } }

package com.gem.service; import com.gem.entity.User; public interface UserService { //用车牌登录 User login(User a); }

package com.gem.service.impl; import java.util.ArrayList; import com.gem.entity.User; import com.gem.service.UserService; public class UserServiceimpl implements UserService { private ArrayList user = new ArrayList<>(); private static UserServiceimpl userserviceimpl = new UserServiceimpl(); //单例 private UserServiceimpl() {} public static UserServiceimpl getUserserviceimpl() { return userserviceimpl; } @Override public User login(User a) { //把车牌录入 user.add(a); return a; } }

The program demonstrates typical backend development patterns such as service interfaces, singleton implementations, in‑memory data storage, and console‑based user interaction, providing a practical example for learning Java application architecture.