定义员工类，具有姓名、年龄、性别属性，并具有构造方法和显示数据方法。定义管理层类，继承员工类，并有自己的属性职务和年薪。定义职员类，继承员工类，并有自己的属性所属部门和月薪。通过测试类显示各层人员信息。

以下是员工类、管理层类、职员类的代码实现：

//员工类
public class Employee {
    private String name;
    private int age;
    private String gender;

    public Employee(String name, int age, String gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    public void displayInfo() {
        System.out.println("Name: " + name);
        System.out.println("Age: " + age);
        System.out.println("Gender: " + gender);
    }
}

//管理层类
public class Management extends Employee {
    private String position;
    private double salary;

    public Management(String name, int age, String gender, String position, double salary) {
        super(name, age, gender);
        this.position = position;
        this.salary = salary;
    }

    public void displayInfo() {
        super.displayInfo();
        System.out.println("Position: " + position);
        System.out.println("Salary: " + salary);
    }
}

//职员类
public class Staff extends Employee {
    private String department;
    private double salary;

    public Staff(String name, int age, String gender, String department, double salary) {
        super(name, age, gender);
        this.department = department;
        this.salary = salary;
    }

    public void displayInfo() {
        super.displayInfo();
        System.out.println("Department: " + department);
        System.out.println("Salary: " + salary);
    }
}

以下是测试类的代码实现：

public class Test {
    public static void main(String[] args) {
        Employee e1 = new Employee("Tom", 25, "Male");
        e1.displayInfo();

        System.out.println("----------------------");

        Management m1 = new Management("Bob", 35, "Male", "CEO", 500000);
        m1.displayInfo();

        System.out.println("----------------------");

        Staff s1 = new Staff("Alice", 30, "Female", "HR", 30000);
        s1.displayInfo();
    }
}

运行结果如下：

Name: Tom
Age: 25
Gender: Male
----------------------
Name: Bob
Age: 35
Gender: Male
Position: CEO
Salary: 500000.0
----------------------
Name: Alice
Age: 30
Gender: Female
Department: HR
Salary: 30000.0