2、设计职员类它继承了Person类并组合了Date类。编写主程序显示职员数据如下：姓名：杨萍出生日期： 1988106性别：女工作部门：团委职务：团委书记工资：6000要求：画出类之间的继承关系图；写出类的设计思路；完整代码。

类之间的继承关系图如下：

          +--------+
          | Person |
          +--------+
              |
              |
              |
          +--------+
          |  Date  |
          +--------+
              |
              |
              |
          +--------+
          | Employee |
          +--------+

类的设计思路：

1. Person类：包括姓名、出生日期、性别三个属性，以及对这些属性的get和set方法。
2. Date类：包括年、月、日三个属性，以及对这些属性的get和set方法。
3. Employee类：继承了Person类，组合了Date类，包括工作部门、职务、工资三个属性，以及对这些属性的get和set方法。

完整代码如下：

class Person {
    private String name;
    private Date birth;
    private String gender;

    public Person(String name, Date birth, String gender) {
        this.name = name;
        this.birth = birth;
        this.gender = gender;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }
}

class Date {
    private int year;
    private int month;
    private int day;

    public Date(int year, int month, int day) {
        this.year = year;
        this.month = month;
        this.day = day;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    public int getMonth() {
        return month;
    }

    public void setMonth(int month) {
        this.month = month;
    }

    public int getDay() {
        return day;
    }

    public void setDay(int day) {
        this.day = day;
    }
}

class Employee extends Person {
    private String department;
    private String position;
    private double salary;
    private Date joinDate;

    public Employee(String name, Date birth, String gender, String department, String position, double salary, Date joinDate) {
        super(name, birth, gender);
        this.department = department;
        this.position = position;
        this.salary = salary;
        this.joinDate = joinDate;
    }

    public String getDepartment() {
        return department;
    }

    public void setDepartment(String department) {
        this.department = department;
    }

    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    public Date getJoinDate() {
        return joinDate;
    }

    public void setJoinDate(Date joinDate) {
        this.joinDate = joinDate;
    }
}

public class EmployeeTest {
    public static void main(String[] args) {
        Date birth = new Date(1988, 10, 6);
        Date joinDate = new Date(2010, 9, 1);
        Employee employee = new Employee("杨萍", birth, "女", "团委", "团委书记", 6000, joinDate);
        System.out.println("姓名：" + employee.getName());
        System.out.println("出生日期：" + employee.getBirth().getYear() + "." + employee.getBirth().getMonth() + "." + employee.getBirth().getDay());
        System.out.println("性别：" + employee.getGender());
        System.out.println("工作部门：" + employee.getDepartment());
        System.out.println("职务：" + employee.getPosition());
        System.out.println("工资：" + employee.getSalary());
    }
}
``