Composite pattern : Example 2

For example, General Manager may have several employees and some of employees are Managers which have several employees.

Design a simple Manager class

class Employee {

   String name;

   double salary;

   Employee(String n, double s){

       name = n;

       salary = s;

   }

   String getName() {

      return name;

   }

   double getSalary() {

      return salary;

   }

   public String toString() {

       return "Employee " + name;

   }

}

class Manager {

   Manager mgr;

   Employee[] ely;

   String dept;

   Manager(Manager mgr,Employee[] e, String d ) {

       this(e, d);

       this.mgr = mgr;

   }

   Manager(Employee[] e, String d) {

       ely = e;

       dept =d;

   }

   String getDept() {

       return dept;

   }

   Manager getManager() {

       return mgr;

   }

   Employee[] getEmployee() {

       return ely;

   }

   public String toString() {

       return dept + " manager";

   }

}

class Test {

   public static void main(String[] args) {

       Employee[] e1 = { new Employee("Aaron", 50),

                         new Employee("Betty", 60)};

       Manager m1 = new Manager(e1, "Accounting");

       

       Employee[] e2 = { new Employee("Cathy", 70),

                         new Employee("Dan", 80),

                         new Employee("Eliz", 90)};

       Manager m2 = new Manager(m1, e2, "Production");

       

       System.out.println(m2);

       Employee[] emp = m2.getEmployee();

       if (emp != null) {

             for (int k = 0; k < emp.length; k++) {

               System.out.println(" "+emp[k]+" Salary: $"

                                   + emp[k].getSalary());       

             }

       }

 

       Manager m = m2.getManager();

       System.out.println(" " + m);

       if (m!= null) {

          Employee[] emps = m.getEmployee();

          if (emps != null) {

             for (int k = 0; k < emps.length; k++) {

                   System.out.println("    " + emps[k]+" Salary: $"

                                      + emps[k].getSalary());

             }

          }

      }   

   }

}