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。

以下是Person、Student、Employee、Faculty、Staff和MyDate类的实现代码：

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;
    }

    public String getName() {
        return name;
    }

    public String getAddress() {
        return address;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public String getEmail() {
        return email;
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + ": " + name;
    }
}

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;
    }

    public int getStatus() {
        return status;
    }

    @Override
    public String toString() {
        return super.toString() + ", " + "Status: " + status;
    }
}

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;
    }

    public String getOffice() {
        return office;
    }

    public double getSalary() {
        return salary;
    }

    public MyDate getHireDate() {
        return hireDate;
    }

    @Override
    public String toString() {
        return super.toString() + ", " + "Office: " + office + ", " + "Salary: " + salary + ", " + "Hire Date: " + hireDate.toString();
    }
}

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;
    }

    public String getOfficeHours() {
        return officeHours;
    }

    public String getRank() {
        return rank;
    }

    @Override
    public String toString() {
        return super.toString() + ", " + "Office Hours: " + officeHours + ", " + "Rank: " + rank;
    }
}

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;
    }

    public String getTitle() {
        return title;
    }

    @Override
    public String toString() {
        return super.toString() + ", " + "Title: " + title;
    }
}

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;
    }

    public int getYear() {
        return year;
    }

    public int getMonth() {
        return month;
    }

    public int getDay() {
        return day;
    }

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

以下是Test1类的实现代码：

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 < persons.length; i++) {
            int type = random.nextInt(4);
            switch (type) {
                case 0:
                    persons[i] = new Person("Person" + i, "Address" + i, "PhoneNumber" + i, "Email" + i);
                    break;
                case 1:
                    persons[i] = new Student("Student" + i, "Address" + i, "PhoneNumber" + i, "Email" + i, random.nextInt(4) + 1);
                    break;
                case 2:
                    persons[i] = new Faculty("Faculty" + i, "Address" + i, "PhoneNumber" + i, "Email" + i, "Office" + i, random.nextDouble() * 10000, new MyDate(2020, random.nextInt(12) + 1, random.nextInt(28) + 1), "OfficeHours" + i, "Rank" + i);
                    break;
                case 3:
                    persons[i] = new Staff("Staff" + i, "Address" + i, "PhoneNumber" + i, "Email" + i, "Office" + i, random.nextDouble() * 10000, new MyDate(2020, random.nextInt(12) + 1, random.nextInt(28) + 1), "Title" + i);
                    break;
            }
        }

        printMessages(persons);
    }

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

Test1类的主要功能是随机产生不同类型的Person、Student、Faculty和Staff对象，并将这些对象存储到数组中。然后，它使用printMessages方法将对象的信息输出。printMessages方法遍历persons数组，并调用每个对象的toString方法来输出对象的信息。由于每个类都重写了toString方法，因此输出的信息包含相应的类名和人名。