编写一个Java程序，定义员工类，具有姓名、年龄、性别属性，并具有构造方法，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， 年薪。定义职员类，继承员工类，并有自己的属性:所属部门，月 薪。

### 回答1：
以下是Java程序实现：

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);
    }
}

public class Management extends Employee {
    private String position;
    private double annualSalary;

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

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

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);
    }
}

在以上代码中，我们定义了一个Employee类，其中包含了员工的基本信息，包括姓名、年龄、性别，并且通过构造方法初始化这些属性，还有一个display()方法用于显示信息。

然后，我们定义了一个Management类和一个Staff类，这两个类都继承了Employee类，并且添加了自己的属性: 管理层类添加了职务和年薪，职员类添加了所属部门和月薪。这两个类也都有一个display()方法用于显示信息。

这里需要注意的是，我们在Management和Staff类中都重写了display()方法，因为我们需要显示员工的所有信息，包括基本信息和自己的特定信息。在这种情况下，我们使用了super关键字来调用父类的display()方法，以便在显示自己的信息之前显示员工的基本信息。

### 回答2：
下面是一个简单的Java程序，实现了员工类、管理层类、职员类的定义。

// 员工类
class Employee {
    private String name;
    private int age;
    private char gender;
    
    public Employee(String name, int age, char gender) {
        this.name = name;
        this.age = age;
        this.gender = gender;
    }

    public void displayData() {
        System.out.println("姓名: " + name);
        System.out.println("年龄: " + age);
        System.out.println("性别: " + gender);
    }
}

// 管理层类，继承员工类
class Manager extends Employee {
    private String position;
    private double annualSalary;
    
    public Manager(String name, int age, char gender, String position, double annualSalary) {
        super(name, age, gender);
        this.position = position;
        this.annualSalary = annualSalary;
    }

    public void displayData() {
        super.displayData();
        System.out.println("职务: " + position);
        System.out.println("年薪: " + annualSalary);
    }
}

// 职员类，继承员工类
class Staff extends Employee {
    private String department;
    private double monthlySalary;
    
    public Staff(String name, int age, char gender, String department, double monthlySalary) {
        super(name, age, gender);
        this.department = department;
        this.monthlySalary = monthlySalary;
    }

    public void displayData() {
        super.displayData();
        System.out.println("所属部门: " + department);
        System.out.println("月薪: " + monthlySalary);
    }
}

public class Main {
    public static void main(String[] args) {
        // 创建一个管理层对象
        Manager manager = new Manager("张三", 40, '男', "经理", 100000);
        manager.displayData();

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

        // 创建一个职员对象
        Staff staff = new Staff("李四", 25, '女', "销售部", 8000);
        staff.displayData();
    }
}

输出结果如下：

姓名: 张三
年龄: 40
性别: 男
职务: 经理
年薪: 100000
----------------
姓名: 李四
年龄: 25
性别: 女
所属部门: 销售部
月薪: 8000

### 回答3：
以下是一个简单的示例Java程序，定义了员工类、管理层类和职员类：

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 displayData() {
        System.out.println("姓名：" + name);
        System.out.println("年龄：" + age);
        System.out.println("性别：" + gender);
    }
}

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

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

    public void displayData() {
        super.displayData();
        System.out.println("职务：" + position);
        System.out.println("年薪：" + annualSalary);
    }
}

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 displayData() {
        super.displayData();
        System.out.println("所属部门：" + department);
        System.out.println("月薪：" + monthlySalary);
    }
}

public class Main {
    public static void main(String[] args) {
        Employee employee = new Employee("张三", 25, "男");
        System.out.println("员工信息：");
        employee.displayData();

        Manager manager = new Manager("李四", 30, "女", "经理", 100000);
        System.out.println("管理层信息：");
        manager.displayData();

        Staff staff = new Staff("王五", 28, "男", "销售部", 5000);
        System.out.println("职员信息：");
        staff.displayData();
    }
}

运行以上代码，将会输出以下结果：

员工信息：
姓名：张三
年龄：25
性别：男

管理层信息：
姓名：李四
年龄：30
性别：女
职务：经理
年薪：100000

职员信息：
姓名：王五
年龄：28
性别：男
所属部门：销售部
月薪：5000