设计Person类，有姓名、地址、电话号码和电子邮件等属性。其子类为Student和Employee，其中Employee类又有教员类Faculty和职员类staff。学生类有班级状态（大一、大二、大三或大四），这些状态为常量。Employee类有办公室、工资和受聘日期。定义一个名为MyDate的类，包含year、month和day数据域。Faculty类有办公时间和级别。Staff类有职务称号。重写每个类中的toString方法，显示相应的类名和人名。 编写测试类Test1，要求随机产生不同的对象，并将这些对象存储到数组中，并用方法printMessages(Person[] persons)将对象的信息输出。

好的，以下是代码实现：

// MyDate类
public class MyDate {
    private int year;
    private int month;
    private int day;

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

    @Override
    public String toString() {
        return year + "-" + month + "-" + day;
    }
}

// Person类
public class Person {
    private String name;
    private String address;
    private String phoneNumber;
    private String email;

    public Person(String name, String address, String phoneNumber, String email) {
        this.name = name;
        this.address = address;
        this.phoneNumber = phoneNumber;
        this.email = email;
    }

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", address='" + address + '\'' +
                ", phoneNumber='" + phoneNumber + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

// Student类
public class Student extends Person {
    public static final int FRESHMAN = 1;
    public static final int SOPHOMORE = 2;
    public static final int JUNIOR = 3;
    public static final int SENIOR = 4;

    private int status;

    public Student(String name, String address, String phoneNumber, String email, int status) {
        super(name, address, phoneNumber, email);
        this.status = status;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + super.name + '\'' +
                ", status=" + status +
                '}';
    }
}

// Employee类
public class Employee extends Person {
    private String office;
    private double salary;
    private MyDate hireDate;

    public Employee(String name, String address, String phoneNumber, String email, String office, double salary, MyDate hireDate) {
        super(name, address, phoneNumber, email);
        this.office = office;
        this.salary = salary;
        this.hireDate = hireDate;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "name='" + super.name + '\'' +
                ", office='" + office + '\'' +
                ", salary=" + salary +
                ", hireDate=" + hireDate +
                '}';
    }
}

// Faculty类
public class Faculty extends Employee {
    private String officeHours;
    private String rank;

    public Faculty(String name, String address, String phoneNumber, String email, String office, double salary, MyDate hireDate, String officeHours, String rank) {
        super(name, address, phoneNumber, email, office, salary, hireDate);
        this.officeHours = officeHours;
        this.rank = rank;
    }

    @Override
    public String toString() {
        return "Faculty{" +
                "name='" + super.name + '\'' +
                ", office='" + super.office + '\'' +
                ", salary=" + super.salary +
                ", hireDate=" + super.hireDate +
                ", officeHours='" + officeHours + '\'' +
                ", rank='" + rank + '\'' +
                '}';
    }
}

// Staff类
public class Staff extends Employee {
    private String title;

    public Staff(String name, String address, String phoneNumber, String email, String office, double salary, MyDate hireDate, String title) {
        super(name, address, phoneNumber, email, office, salary, hireDate);
        this.title = title;
    }

    @Override
    public String toString() {
        return "Staff{" +
                "name='" + super.name + '\'' +
                ", office='" + super.office + '\'' +
                ", salary=" + super.salary +
                ", hireDate=" + super.hireDate +
                ", title='" + title + '\'' +
                '}';
    }
}

// Test1类
import java.util.Random;

public class Test1 {
    public static void main(String[] args) {
        Person[] persons = new Person[10];
        Random random = new Random();

        for (int i = 0; i < 10; i++) {
            int type = random.nextInt(4) + 1; // 生成1-4的随机数，表示Person的子类类型
            String name = "Person" + i;
            String address = "Address" + i;
            String phoneNumber = "123456789";
            String email = "person" + i + "@test.com";

            switch (type) {
                case 1:
                    persons[i] = new Student(name, address, phoneNumber, email, random.nextInt(4) + 1);
                    break;
                case 2:
                    persons[i] = new Faculty(name, address, phoneNumber, email, "Office" + i, random.nextDouble() * 10000, new MyDate(2021, 1, 1), "9:00-17:00", "Professor");
                    break;
                case 3:
                    persons[i] = new Staff(name, address, phoneNumber, email, "Office" + i, random.nextDouble() * 10000, new MyDate(2021, 1, 1), "Manager");
                    break;
                case 4:
                    persons[i] = new Employee(name, address, phoneNumber, email, "Office" + i, random.nextDouble() * 10000, new MyDate(2021, 1, 1));
                    break;
            }
        }

        printMessages(persons);
    }

    public static void printMessages(Person[] persons) {
        for (Person person : persons) {
            System.out.println(person.toString());
        }
    }
}

在Test1类中，我们首先生成了一个长度为10的Person类型的数组，然后通过随机数来生成不同的Person子类对象，最后打印出每个对象的信息。