CompositePattern_GFG

///////////////////////////////Interface Component

public interface Employee
{
    public void showEmployeeDetails();
}

///////////////////////////////Leaf

public class Developer implements Employee
{
    private String name;
    private long empId;
    private String position;

    public Developer(long empId, String name, String position)
    {
        this.empId = empId;
        this.name = name;
                this.position = position;
    }

    @Override
    public void showEmployeeDetails()
    {
        System.out.println(empId+" " +name+);
    }
}

///////////////////////////////Composite

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

public class CompanyDirectory implements Employee
{
    private List<Employee> employeeList = new ArrayList<Employee>();

    @Override
    public void showEmployeeDetails()
    {
        for(Employee emp:employeeList)
        {
            emp.showEmployeeDetails();
        }
    }

    public void addEmployee(Employee emp)
    {
        employeeList.add(emp);
    }

    public void removeEmployee(Employee emp)
    {
        employeeList.remove(emp);
    }
}

///////////////////////////////Client

public class Company
{
    public static void main (String[] args)
    {
        Developer dev1 = new Developer(100, "Lokesh Sharma", "Pro Developer");
        Developer dev2 = new Developer(101, "Vinay Sharma", "Developer");
        CompanyDirectory engDirectory = new CompanyDirectory();
        engDirectory.addEmployee(dev1);
        engDirectory.addEmployee(dev2);

        Manager man1 = new Manager(200, "Kushagra Garg", "SEO Manager");
        Manager man2 = new Manager(201, "Vikram Sharma ", "Kushagra's Manager");

        CompanyDirectory accDirectory = new CompanyDirectory();
        accDirectory.addEmployee(man1);
        accDirectory.addEmployee(man2);

        CompanyDirectory directory = new CompanyDirectory();
        directory.addEmployee(engDirectory);
        directory.addEmployee(accDirectory);
        directory.showEmployeeDetails();
    }
}