java实现 编程完整实现 （教材P118 四、编程题） 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。

以下是Java实现的代码：

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

管理层类：

public class Manager extends Employee {
    private String position;
    private double salary;

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

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

职员类：

public class Staff extends Employee {
    private String department;
    private double monthlySalary;

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

    public void display() {
        super.display();
        System.out.println("Department: " + department);
        System.out.println("Monthly Salary: " + monthlySalary);
    }
}

以上就是完整的Java实现代码。您可以通过创建对象并调用相应的方法来使用这些类。例如：

Employee employee = new Employee("John", 30, "Male");
employee.display();

Manager manager = new Manager("Jane", 40, "Female", "CEO", 100000);
manager.display();

Staff staff = new Staff("Tom", 25, "Male", "HR", 5000);
staff.display();