用Java （1）定义一个Employee类：这是所有员工总的父类，属性：员工的姓名,员工的年龄。提供构造器和输出员工信息的方法。 （2）定义一个经理类Manager：Employee的子类，属性：职位、薪水。提供构造器和输出经理信息的方法，提供一个经理的管理行为方法。 （3）定义一个工人类Worker：Employee的子类，属性：部门、薪水。提供构造器和输出工人信息的方法，提供一个工人的工作方法。 （4）定义一个公共类EmployeeAPP类，创建上述的三个类的实例，并测试其中方法。

下面是Java代码实现：

// Employee类
public class Employee {
    private String name;
    private int age;

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

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

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

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

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

    public void manage() {
        System.out.println("I am managing.");
    }
}

// 工人类Worker
public class Worker extends Employee {
    private String department;
    private double salary;

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

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

    public void work() {
        System.out.println("I am working.");
    }
}

// EmployeeAPP类
public class EmployeeAPP {
    public static void main(String[] args) {
        Manager manager = new Manager("Tom", 35, "CEO", 10000);
        manager.display();
        manager.manage();

        System.out.println();

        Worker worker = new Worker("Jack", 25, "IT", 5000);
        worker.display();
        worker.work();
    }
}

运行结果：

Name: Tom
Age: 35
Position: CEO
Salary: 10000.0
I am managing.

Name: Jack
Age: 25
Department: IT
Salary: 5000.0
I am working.