组合模式

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

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

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

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

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

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

public class CompositePatternDemo {
    public static void main(String[] args) {
        Employee CEO = new Employee("John", "CEO", 30000);

        Employee headSales = new Employee("Robert", "Head Sales", 20000);

        Employee headMarketing = new Employee("Michel", "Head Marketing", 20000);

        Employee clerk1 = new Employee("Laura", "Marketing", 10000);
        Employee clerk2 = new Employee("Bob", "Marketing", 10000);

        Employee salesExecutive1 = new Employee("Richard", "Sales", 10000);
        Employee salesExecutive2 = new Employee("Rob", "Sales", 10000);

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

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

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

        //打印该组织的所有员工
        System.out.println(CEO);
        for (Employee headEmployee : CEO.getSubordinates()) {
            System.out.println(headEmployee);
            for (Employee employee : headEmployee.getSubordinates()) {
                System.out.println(employee);
            }
        }
    }
}