Composite پترن در جاوا (Design Pattern)

public class Employee {
     private String name;
     private String dept;
     private int salary;
     private List<Employee> subordinates;

     public Employee(String name, String dept, int sal) {
          this.name = name;
          this.dept = dept;
          this.salary = sal;
          subordinates = new ArrayList<Employee>();
     }

     public void add(Employee e) {
          subordinates.add(e);
     }

     public void remove(Employee e) {
          subordinates.remove(e);
     }

     public List<Employee> getSubordinates() {
          return subordinates;
     }

     public String toString() {
          return ("Employee :[ Name : " + name + ", dept : " + dept
                   + ", salary :" + salary + " ]");
     }
}

     public static void main(String[] args) {

          Employee CEO = new Employee("Saeed Gharibi", "CEO", 30000);

          Employee headSales = new Employee("CodeGate 1", "Developer", 20000);

          Employee headMarketing = new Employee("CodeGate 2", "Marketing", 20000);

          Employee clerk1 = new Employee("CodeGate 3", "Marketing", 10000);
          Employee clerk2 = new Employee("CodeGate 4", "Marketing", 10000);

          Employee salesExecutive1 = new Employee("CodeGate 5", "Sales", 10000);
          Employee salesExecutive2 = new Employee("CodeGate 6", "Sales", 10000);

          CEO.add(headSales);
          CEO.add(headMarketing);

          headSales.add(salesExecutive1);
          headSales.add(salesExecutive2);

          headMarketing.add(clerk1);
          headMarketing.add(clerk2);

          System.out.println(CEO);

          for (Employee headEmployee : CEO.getSubordinates()) {
              System.out.println(headEmployee);

              for (Employee employee : headEmployee.getSubordinates()) {
                   System.out.println(employee);
              }
          }
     }