如何利用Java实现员工考勤管理系统

public class Employee {
    private String id;
    private String name;
    private String department;

    public Employee(String id, String name, String department) {
        this.id = id;
        this.name = name;
        this.department = department;
    }

    // getter 方法
    public String getId() { return id; }
    public String getName() { return name; }
    public String getDepartment() { return department; }
}

import java.time.LocalDateTime;

public class AttendanceRecord {
    private String employeeId;
    private LocalDateTime checkInTime;
    private LocalDateTime checkOutTime;

    public AttendanceRecord(String employeeId) {
        this.employeeId = employeeId;
        this.checkInTime = null;
        this.checkOutTime = null;
    }

    public void checkIn() {
        this.checkInTime = LocalDateTime.now();
    }

    public void checkOut() {
        this.checkOutTime = LocalDateTime.now();
    }

    // 判断是否迟到（假设9:00后算迟到）
    public boolean isLate() {
        if (checkInTime == null) return false;
        int hour = checkInTime.getHour();
        int minute = checkInTime.getMinute();
        return (hour > 9) || (hour == 9 && minute > 0);
    }

    // getter 方法
    public String getEmployeeId() { return employeeId; }
    public LocalDateTime getCheckInTime() { return checkInTime; }
    public LocalDateTime getCheckOutTime() { return checkOutTime; }
}

import java.util.*;

public class AttendanceSystem {
    private Map<String, Employee> employees;
    private Map<String, List<AttendanceRecord>> attendanceRecords;

    public AttendanceSystem() {
        employees = new HashMap<>();
        attendanceRecords = new HashMap<>();
    }

    public void addEmployee(Employee emp) {
        employees.put(emp.getId(), emp);
        attendanceRecords.put(emp.getId(), new ArrayList<>());
    }

    public void recordCheckIn(String empId) {
        List<AttendanceRecord> records = attendanceRecords.get(empId);
        if (records == null || !employees.containsKey(empId)) {
            System.out.println("员工不存在！");
            return;
        }
        AttendanceRecord todayRecord = findTodayRecord(empId);
        if (todayRecord != null) {
            if (todayRecord.getCheckInTime() == null) {
                todayRecord.checkIn();
                System.out.println("打卡成功：" + employees.get(empId).getName() + " 上班打卡");
            } else {
                System.out.println("今日已打卡上班！");
            }
        } else {
            AttendanceRecord newRecord = new AttendanceRecord(empId);
            newRecord.checkIn();
            records.add(newRecord);
            System.out.println("打卡成功：" + employees.get(empId).getName() + " 上班打卡");
        }
    }

    public void recordCheckOut(String empId) {
        AttendanceRecord todayRecord = findTodayRecord(empId);
        if (todayRecord == null) {
            System.out.println("请先打卡上班！");
            return;
        }
        if (todayRecord.getCheckOutTime() == null) {
            todayRecord.checkOut();
            System.out.println("打卡成功：" + employees.get(empId).getName() + " 下班打卡");
        } else {
            System.out.println("今日已打卡下班！");
        }
    }

    private AttendanceRecord findTodayRecord(String empId) {
        List<AttendanceRecord> records = attendanceRecords.get(empId);
        if (records == null) return null;
        LocalDateTime today = LocalDateTime.now();
        for (AttendanceRecord record : records) {
            if (record.getCheckInTime() != null &&
                record.getCheckInTime().toLocalDate().equals(today.toLocalDate())) {
                return record;
            }
        }
        return null;
    }

    public void showMonthlyReport(String empId, int year, int month) {
        Employee emp = employees.get(empId);
        if (emp == null) {
            System.out.println("员工不存在！");
            return;
        }
        List<AttendanceRecord> records = attendanceRecords.get(empId);
        int presentDays = 0;
        int lateCount = 0;

        for (AttendanceRecord record : records) {
            if (record.getCheckInTime() != null) {
                if (record.getCheckInTime().getYear() == year &&
                    record.getCheckInTime().getMonthValue() == month) {
                    presentDays++;
                    if (record.isLate()) {
                        lateCount++;
                    }
                }
            }
        }

        System.out.println("=== " + year + "年" + month + "月 考勤报告 ===");
        System.out.println("员工：" + emp.getName());
        System.out.println("出勤天数：" + presentDays);
        System.out.println("迟到次数：" + lateCount);
    }
}

public class Main {
    public static void main(String[] args) {
        AttendanceSystem system = new AttendanceSystem();

        Employee emp1 = new Employee("E001", "张三", "技术部");
        system.addEmployee(emp1);

        system.recordCheckIn("E001");  // 模拟上班打卡
        try {
            Thread.sleep(1000); // 延迟一秒
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        system.recordCheckOut("E001"); // 模拟下班打卡

        system.showMonthlyReport("E001", 2024, 7);
    }
}