EmployeeManagementSystem.java

import java.util.*;

abstract class Employee{
    private int employeeId;
    private String name;
    private double baseSalary;

    public Employee(int employeeId, String name, double baseSalary) {
        this.employeeId = employeeId;
        this.name = name;
        this.baseSalary = baseSalary;
    }

    public int getEmployeeId() {
        return employeeId;
    }

    public String getName() {
        return name;
    }

    public double getBaseSalary() {
        return baseSalary;
    }

    public void setBaseSalary(double baseSalary) {
        this.baseSalary = baseSalary;
    }

    public abstract double calculateSalary();

    public void displayDetails() {
        System.out.println("Employee ID: " + employeeId);
        System.out.println("Name: " + name);
        System.out.println("Base Salary: " + baseSalary);
        System.out.println("Final Salary: " + calculateSalary());
    }
}
interface Department {
    void assignDepartment(String departmentName);
    String getDepartmentDetails();
}

// Subclass: FullTimeEmployee
class FullTimeEmployee extends Employee implements Department {
    private String department;
    private double bonus;

    public FullTimeEmployee(int employeeId, String name, double baseSalary, double bonus) {
        super(employeeId, name, baseSalary);
        this.bonus = bonus;
    }

    @Override
    public double calculateSalary() {
        return getBaseSalary() + bonus;
    }

    @Override
    public void assignDepartment(String departmentName) {
        this.department = departmentName;
    }

    @Override
    public String getDepartmentDetails() {
        return "Department: " + department;
    }

    @Override
    public void displayDetails() {
        super.displayDetails();
        System.out.println(getDepartmentDetails());
    }
}

// Subclass: PartTimeEmployee
class PartTimeEmployee extends Employee implements Department {
    private String department;
    private int hoursWorked;
    private double hourlyRate;

    public PartTimeEmployee(int employeeId, String name, double hourlyRate, int hoursWorked) {
        super(employeeId, name, 0);
        this.hourlyRate = hourlyRate;
        this.hoursWorked = hoursWorked;
    }

    @Override
    public double calculateSalary() {
        return hoursWorked * hourlyRate;
    }

    @Override
    public void assignDepartment(String departmentName) {
        this.department = departmentName;
    }

    @Override
    public String getDepartmentDetails() {
        return "Department: " + department;
    }

    @Override
    public void displayDetails() {
        super.displayDetails();
        System.out.println(getDepartmentDetails());
    }
}
public class EmployeeManagementSystem {
    public static void main(String[] args) {
        List<Employee> employees = new ArrayList<>();

        FullTimeEmployee emp1 = new FullTimeEmployee(101, "Ajay Kumar", 5000000, 50000);
        emp1.assignDepartment("Engineering");

        PartTimeEmployee emp2 = new PartTimeEmployee(102, "Amit Singh", 20, 80);
        emp2.assignDepartment("Support");

        employees.add(emp1);
        employees.add(emp2);

        for (Employee emp : employees) {
            emp.displayDetails();
            System.out.println();
        }
    }
}

//SampleOutput
//Employee ID: 101
//Name: Ajay Kumar
//Base Salary: 5000000.0
//Final Salary: 5050000.0
//Department: Engineering
//
//Employee ID: 102
//Name: Amit Singh
//Base Salary: 0.0
//Final Salary: 1600.0
//Department: Support