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，根据您的需求，我为您提供以下代码实现：

Person.java

public class Person {
    private String name;
    private String address;
    private String phone;
    private String email;

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

    public String getName() {
        return name;
    }

    public String getAddress() {
        return address;
    }

    public String getPhone() {
        return phone;
    }

    public String getEmail() {
        return email;
    }

    public String toString() {
        return "Person: " + name;
    }
}

Student.java

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

    public int getStatus() {
        return status;
    }

    public String toString() {
        return "Student: " + getName();
    }
}

Employee.java

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

    public Employee(String name, String address, String phone, String email, String office, double salary, MyDate hireDate) {
        super(name, address, phone, 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;
    }

    public String toString() {
        return "Employee: " + getName();
    }
}

Faculty.java

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

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

    public String getOfficeHours() {
        return officeHours;
    }

    public String getRank() {
        return rank;
    }

    public String toString() {
        return "Faculty: " + getName();
    }
}

Staff.java

public class Staff extends Employee {
    private String title;

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

    public String getTitle() {
        return title;
    }

    public String toString() {
        return "Staff: " + getName();
    }
}

MyDate.java

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;
    }

    public String toString() {
        return month + "/" + day + "/" + year;
    }
}

Test1.java

import java.util.Random;

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

        for (int i = 0; i < persons.length; i++) {
            int type = rand.nextInt(4);

            switch (type) {
                case 0:
                    persons[i] = new Person("Person" + i, "Address" + i, "Phone" + i, "Email" + i);
                    break;
                case 1:
                    int status = rand.nextInt(4) + 1;
                    persons[i] = new Student("Student" + i, "Address" + i, "Phone" + i, "Email" + i, status);
                    break;
                case 2:
                    String office = "Office" + i;
                    double salary = rand.nextDouble() * 10000;
                    int year = rand.nextInt(21) + 2000;
                    int month = rand.nextInt(12) + 1;
                    int day = rand.nextInt(28) + 1;
                    MyDate hireDate = new MyDate(year, month, day);
                    int facultyType = rand.nextInt(2);
                    if (facultyType == 0) {
                        String officeHours = "OfficeHours" + i;
                        String rank = "Rank" + i;
                        persons[i] = new Faculty("Faculty" + i, "Address" + i, "Phone" + i, "Email" + i, office, salary, hireDate, officeHours, rank);
                    } else {
                        String title = "Title" + i;
                        persons[i] = new Staff("Staff" + i, "Address" + i, "Phone" + i, "Email" + i, office, salary, hireDate, title);
                    }
                    break;
                case 3:
                    break;
            }
        }

        printMessages(persons);
    }

    public static void printMessages(Person[] persons) {
        for (Person p : persons) {
            if (p != null) {
                System.out.println(p);
            }
        }
    }
}

这份代码实现了您所需要的功能。Test1类中随机产生不同的对象，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。每个类中的toString方法都被重写，以显示相应的类名和人名。