如何在Java中实现返回公司内部员工层次结构的函数

public class Employee {
    private String name;
    private String position;
    private double salary;
    private List<Employee> subordinates;

    public Employee(String name, String position, double salary) {
        this.name = name;
        this.position = position;
        this.salary = salary;
        this.subordinates = new ArrayList<>();
    }

    // Getter and setter methods

    public void addSubordinate(Employee employee) {
        subordinates.add(employee);
    }

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

    public String toString() {
        return "Name: " + name + ", Position: " + position + ", Salary: " + salary;
    }
}

public class Company {
    private Employee CEO;

    public Company(Employee CEO) {
        this.CEO = CEO;
    }

    public void addEmployee(Employee manager, Employee employee) {
        manager.addSubordinate(employee);
    }

    public Employee getCEO() {
        return CEO;
    }

    public void printHierarchy(Employee employee, int level) {
        StringBuilder indent = new StringBuilder();
        for (int i = 0; i < level; i++) {
            indent.append("  ");
        }
        System.out.println(indent.toString() + employee.toString());
        for (Employee subordinate : employee.getSubordinates()) {
            printHierarchy(subordinate, level + 1);
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Employee CEO = new Employee("John", "CEO", 1000000);
        Employee manager1 = new Employee("Alice", "Manager", 500000);
        Employee manager2 = new Employee("Bob", "Manager", 500000);
        Employee employee1 = new Employee("Tom", "Employee", 200000);
        Employee employee2 = new Employee("Jerry", "Employee", 200000);

        Company company = new Company(CEO);
        company.addEmployee(CEO, manager1);
        company.addEmployee(CEO, manager2);
        company.addEmployee(manager1, employee1);
        company.addEmployee(manager2, employee2);

        company.printHierarchy(CEO, 0);
    }
}

Name: John, Position: CEO, Salary: 1000000
  Name: Alice, Position: Manager, Salary: 500000
    Name: Tom, Position: Employee, Salary: 200000
  Name: Bob, Position: Manager, Salary: 500000
    Name: Jerry, Position: Employee, Salary: 200000