写一个java的人力资源管理系统

好的，下面是一个简单的Java人力资源管理系统的示例代码：

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class HRManagementSystem {
    private List<Employee> employees;

    public HRManagementSystem() {
        employees = new ArrayList<>();
    }

    public void addEmployee(Employee employee) {
        employees.add(employee);
    }

    public void removeEmployee(Employee employee) {
        employees.remove(employee);
    }

    public List<Employee> getAllEmployees() {
        return employees;
    }

    public List<Employee> searchEmployees(String keyword) {
        List<Employee> result = new ArrayList<>();
        for (Employee employee : employees) {
            if (employee.getFirstName().contains(keyword) || employee.getLastName().contains(keyword)) {
                result.add(employee);
            }
        }
        return result;
    }

    public static void main(String[] args) {
        HRManagementSystem system = new HRManagementSystem();

        // 添加员工
        Employee employee1 = new Employee("Tom", "Smith", new Date(), 3000);
        Employee employee2 = new Employee("Alice", "Jones", new Date(), 3500);
        Employee employee3 = new Employee("Bob", "Brown", new Date(), 4000);
        system.addEmployee(employee1);
        system.addEmployee(employee2);
        system.addEmployee(employee3);

        // 搜索员工
        List<Employee> searchResult = system.searchEmployees("Tom");
        System.out.println("搜索结果:");
        for (Employee employee : searchResult) {
            System.out.println(employee.getFirstName() + " " + employee.getLastName());
        }

        // 删除员工
        system.removeEmployee(employee3);
        System.out.println("删除员工后，现有员工:");
        for (Employee employee : system.getAllEmployees()) {
            System.out.println(employee.getFirstName() + " " + employee.getLastName());
        }
    }
}

class Employee {
    private String firstName;
    private String lastName;
    private Date hireDate;
    private int salary;

    public Employee(String firstName, String lastName, Date hireDate, int salary) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.hireDate = hireDate;
        this.salary = salary;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public Date getHireDate() {
        return hireDate;
    }

    public int getSalary() {
        return salary;
    }
}

以上示例代码实现了人力资源管理系统的一个简单功能，包括员工信息管理、搜索员工和删除员工。在实际项目中，还需要添加更多的模块和功能，比如薪资管理、培训管理、招聘管理等。