Employee Management System in Java

import java.util.*;

class Employee {
    private int id;
    private String name;
    private String department;
    private double salary;

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

    public int getId() { return id; }
    public String getName() { return name; }
    public String getDepartment() { return department; }
    public double getSalary() { return salary; }

    public void setName(String name) { this.name = name; }
    public void setDepartment(String department) { this.department = department; }
    public void setSalary(double salary) { this.salary = salary; }

    @Override
    public String toString() {
        return "Employee [ID=" + id + ", Name=" + name + ", Department=" + department + ", Salary=" + salary + "]";
    }
}

class EmployeeManager {
    private Map<Integer, Employee> employees = new HashMap<>();

    public void addEmployee(Employee emp) {
        employees.put(emp.getId(), emp);
    }

    public void updateEmployee(int id, String name, String department, double salary) {
        Employee emp = employees.get(id);
        if (emp != null) {
            emp.setName(name);
            emp.setDepartment(department);
            emp.setSalary(salary);
        }
    }

    public void deleteEmployee(int id) {
        employees.remove(id);
    }

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

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

        manager.addEmployee(new Employee(1, "Alice", "HR", 50000));
        manager.addEmployee(new Employee(2, "Bob", "IT", 60000));

        System.out.println("Employee List:");
        manager.listEmployees();

        manager.updateEmployee(2, "Bob", "IT", 65000);

        System.out.println("Updated Employee List:");
        manager.listEmployees();

        manager.deleteEmployee(1);

        System.out.println("Final Employee List:");
        manager.listEmployees();
    }
}