用Java设计一个公司员工管理系统

好的，我可以给您提供一个简单的员工管理系统的实现思路和代码框架。

1. 定义一个员工类，包含员工的基本信息，如姓名、性别、年龄、工号、部门等等。同时在员工类中提供一些基本的操作方法，如获取和设置员工信息的方法等。

public class Employee {
    private String name;
    private String gender;
    private int age;
    private int empNo;
    private String department;

    public Employee(String name, String gender, int age, int empNo, String department) {
        this.name = name;
        this.gender = gender;
        this.age = age;
        this.empNo = empNo;
        this.department = department;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public int getEmpNo() {
        return empNo;
    }

    public void setEmpNo(int empNo) {
        this.empNo = empNo;
    }

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", age=" + age +
                ", empNo=" + empNo +
                ", department='" + department + '\'' +
                '}';
    }
}

2. 定义一个员工管理类，包含对员工信息进行增删改查等操作的方法。在这个类中，我们使用 Map 来存储员工信息。

import java.util.HashMap;
import java.util.Map;

public class EmployeeManagement {
    private Map<Integer, Employee> employees;

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

    public void addEmployee(Employee employee) {
        employees.put(employee.getEmpNo(), employee);
    }

    public void removeEmployee(int empNo) {
        employees.remove(empNo);
    }

    public void updateEmployee(Employee employee) {
        employees.put(employee.getEmpNo(), employee);
    }

    public Employee findEmployee(int empNo) {
        return employees.get(empNo);
    }

    public void printAllEmployees() {
        for (Employee employee : employees.values()) {
            System.out.println(employee);
        }
    }
}

3. 接下来，我们需要设计一个登录界面，用于员工登录系统。在登录界面中，我们要求员工输入用户名和密码，然后检查员工输入的信息是否正确。如果正确，就可以允许员工进入系统，否则需要提示员工重新输入用户名和密码。

import java.util.Scanner;

public class Login {
    private static final String USERNAME = "admin";
    private static final String PASSWORD = "password";

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Welcome to Employee Management System!");
        System.out.print("Please enter username: ");
        String username = scanner.nextLine();

        System.out.print("Please enter password: ");
        String password = scanner.nextLine();

        if (username.equals(USERNAME) && password.equals(PASSWORD)) {
            System.out.println("Login successful!");

            EmployeeManagement employeeManagement = new EmployeeManagement();

            // TODO: 在这里添加员工信息和操作员工信息的代码

        } else {
            System.out.println("Invalid username or password. Please try again.");
        }
    }
}

4. 最后，我们将以上三个部分整合在一起，形成一个完整的员工管理系统。

import java.util.Scanner;

public class EmployeeManagementSystem {
    private static final String USERNAME = "admin";
    private static final String PASSWORD = "password";

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("Welcome to Employee Management System!");
        System.out.print("Please enter username: ");
        String username = scanner.nextLine();

        System.out.print("Please enter password: ");
        String password = scanner.nextLine();

        if (username.equals(USERNAME) && password.equals(PASSWORD)) {
            System.out.println("Login successful!");

            EmployeeManagement employeeManagement = new EmployeeManagement();

            // 添加员工信息
            Employee employee1 = new Employee("Tom", "Male", 30, 1001, "Sales");
            employeeManagement.addEmployee(employee1);

            Employee employee2 = new Employee("Lucy", "Female", 25, 1002, "Marketing");
            employeeManagement.addEmployee(employee2);

            // 查询员工信息
            Employee employee = employeeManagement.findEmployee(1001);
            System.out.println(employee);

            // 更新员工信息
            employee1.setAge(31);
            employeeManagement.updateEmployee(employee1);
            System.out.println(employee1);

            // 删除员工信息
            employeeManagement.removeEmployee(1002);
            employeeManagement.printAllEmployees();

        } else {
            System.out.println("Invalid username or password. Please try again.");
        }

        scanner.close();
    }
}

这个员工管理系统只是一个简单的示例，您可以根据自己的需求和实际情况来进行扩展和优化。