java 查询树结构部门关联人员

对于 Java 查询树结构部门关联人员，您可以使用递归算法来实现。下面是一个简单的示例代码：

首先，您需要定义一个部门类 `Department`，其中包含部门的名称、所属上级部门以及部门下的员工列表等属性。然后，您可以使用一个树形结构来组织部门之间的关系。

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

public class Department {
    private String name;
    private Department parent;
    private List<Employee> employees;

    public Department(String name, Department parent) {
        this.name = name;
        this.parent = parent;
        this.employees = new ArrayList<>();
    }

    public String getName() {
        return name;
    }

    public Department getParent() {
        return parent;
    }

    public List<Employee> getEmployees() {
        return employees;
    }

    // 添加员工
    public void addEmployee(Employee employee) {
        employees.add(employee);
    }
}

然后，您可以定义一个员工类 `Employee`，其中包含员工的姓名等属性。

public class Employee {
    private String name;

    public Employee(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }
}

接下来，我们可以创建一棵部门树，并添加部门和员工信息。

public class Main {
    public static void main(String[] args) {
        // 创建根部门
        Department root = new Department("总部", null);

        // 创建子部门
        Department department1 = new Department("部门1", root);
        Department department2 = new Department("部门2", root);

        // 创建员工
        Employee employee1 = new Employee("员工1");
        Employee employee2 = new Employee("员工2");
        Employee employee3 = new Employee("员工3");
        Employee employee4 = new Employee("员工4");

        // 将员工添加到部门中
        department1.addEmployee(employee1);
        department1.addEmployee(employee2);
        department2.addEmployee(employee3);
        department2.addEmployee(employee4);

        // 查询树结构部门关联人员
        List<Employee> allEmployees = getAllEmployees(root);
        for (Employee employee : allEmployees) {
            System.out.println(employee.getName());
        }
    }

    // 递归查询树结构部门关联人员
    public static List<Employee> getAllEmployees(Department department) {
        List<Employee> allEmployees = new ArrayList<>();

        // 添加当前部门的员工列表
        allEmployees.addAll(department.getEmployees());

        // 递归查询子部门的员工列表
        List<Department> childDepartments = getChildDepartments(department);
        for (Department childDepartment : childDepartments) {
            allEmployees.addAll(getAllEmployees(childDepartment));
        }

        return allEmployees;
    }

    // 获取子部门列表
    public static List<Department> getChildDepartments(Department department) {
        List<Department> childDepartments = new ArrayList<>();
        
        // TODO: 根据实际情况获取子部门列表
        
        return childDepartments;
    }
}

在上述示例中，我们创建了一个包含树形结构部门和员工信息的部门树。然后，通过调用 `getAllEmployees` 方法，可以递归地获取所有部门关联的人员信息。您可以根据实际情况修改 `getChildDepartments` 方法，获取子部门列表。