设计电话薄程序 （1）根据下面的描述设计类层次关系。 1）联系人信息有：姓名、电话、备注； 2）家人信息：还包括地址、固定电话； 3）朋友信息：还包括类别（同学、同事、其他朋友）； 4）工作联系人信息：还包括公司、部门、职务。 （2）注意重写toString（），返回每类对象的全部信息 (3) 要求在父类中定义display()方法，此方法中将toString()结果输出值控台 (4）提供添加、删除、修改、查看指定成员、查看所有联系人信息等方法的可运行的Java程序

以下是对应的Java程序：

import java.util.ArrayList;
import java.util.Scanner;

// 联系人类
class Contact {
    protected String name;
    protected String phone;
    protected String remark;

    // 构造函数
    public Contact(String name, String phone, String remark) {
        this.name = name;
        this.phone = phone;
        this.remark = remark;
    }

    // 显示联系人信息
    public void display() {
        System.out.println(toString());
    }

    // 重写toString()方法
    @Override
    public String toString() {
        return "姓名：" + name + "，电话：" + phone + "，备注：" + remark;
    }
}

// 家人类
class Family extends Contact {
    private String address;
    private String homePhone;

    // 构造函数
    public Family(String name, String phone, String remark, String address, String homePhone) {
        super(name, phone, remark);
        this.address = address;
        this.homePhone = homePhone;
    }

    // 显示联系人信息
    @Override
    public void display() {
        System.out.println(toString());
    }

    // 重写toString()方法
    @Override
    public String toString() {
        return super.toString() + "，地址：" + address + "，固定电话：" + homePhone;
    }
}

// 朋友类
class Friend extends Contact {
    private String category;

    // 构造函数
    public Friend(String name, String phone, String remark, String category) {
        super(name, phone, remark);
        this.category = category;
    }

    // 显示联系人信息
    @Override
    public void display() {
        System.out.println(toString());
    }

    // 重写toString()方法
    @Override
    public String toString() {
        return super.toString() + "，类别：" + category;
    }
}

// 工作联系人类
class WorkContact extends Contact {
    private String company;
    private String department;
    private String position;

    // 构造函数
    public WorkContact(String name, String phone, String remark, String company, String department, String position) {
        super(name, phone, remark);
        this.company = company;
        this.department = department;
        this.position = position;
    }

    // 显示联系人信息
    @Override
    public void display() {
        System.out.println(toString());
    }

    // 重写toString()方法
    @Override
    public String toString() {
        return super.toString() + "，公司：" + company + "，部门：" + department + "，职务：" + position;
    }
}

// 电话薄类
class PhoneBook {
    private ArrayList<Contact> contacts;

    // 构造函数
    public PhoneBook() {
        contacts = new ArrayList<Contact>();
    }

    // 添加联系人
    public void addContact(Contact contact) {
        contacts.add(contact);
        System.out.println("添加成功！");
    }

    // 删除联系人
    public void deleteContact(int index) {
        if (index >= 0 && index < contacts.size()) {
            contacts.remove(index);
            System.out.println("删除成功！");
        } else {
            System.out.println("删除失败：输入的索引不合法！");
        }
    }

    // 修改联系人
    public void modifyContact(int index, Contact newContact) {
        if (index >= 0 && index < contacts.size()) {
            contacts.set(index, newContact);
            System.out.println("修改成功！");
        } else {
            System.out.println("修改失败：输入的索引不合法！");
        }
    }

    // 查看指定成员
    public void viewContact(int index) {
        if (index >= 0 && index < contacts.size()) {
            contacts.get(index).display();
        } else {
            System.out.println("查看失败：输入的索引不合法！");
        }
    }

    // 查看所有联系人信息
    public void viewAllContacts() {
        if (contacts.size() > 0) {
            for (int i = 0; i < contacts.size(); i++) {
                System.out.print(i + 1 + ". ");
                contacts.get(i).display();
            }
        } else {
            System.out.println("电话薄为空！");
        }
    }
}

// 主程序
public class PhoneBookMain {
    public static void main(String[] args) {
        PhoneBook phoneBook = new PhoneBook();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 添加联系人");
            System.out.println("2. 删除联系人");
            System.out.println("3. 修改联系人");
            System.out.println("4. 查看指定成员");
            System.out.println("5. 查看所有联系人信息");
            System.out.println("6. 退出程序");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1: // 添加联系人
                    System.out.println("请选择联系人类型：");
                    System.out.println("1. 家人");
                    System.out.println("2. 朋友");
                    System.out.println("3. 工作联系人");
                    int type = scanner.nextInt();

                    System.out.println("请输入姓名：");
                    String name = scanner.next();
                    System.out.println("请输入电话：");
                    String phone = scanner.next();
                    System.out.println("请输入备注：");
                    String remark = scanner.next();

                    if (type == 1) { // 添加家人
                        System.out.println("请输入地址：");
                        String address = scanner.next();
                        System.out.println("请输入固定电话：");
                        String homePhone = scanner.next();
                        Family family = new Family(name, phone, remark, address, homePhone);
                        phoneBook.addContact(family);
                    } else if (type == 2) { // 添加朋友
                        System.out.println("请输入类别：");
                        String category = scanner.next();
                        Friend friend = new Friend(name, phone, remark, category);
                        phoneBook.addContact(friend);
                    } else if (type == 3) { // 添加工作联系人
                        System.out.println("请输入公司：");
                        String company = scanner.next();
                        System.out.println("请输入部门：");
                        String department = scanner.next();
                        System.out.println("请输入职务：");
                        String position = scanner.next();
                        WorkContact workContact = new WorkContact(name, phone, remark, company, department, position);
                        phoneBook.addContact(workContact);
                    }
                    break;
                case 2: // 删除联系人
                    System.out.println("请输入要删除的联系人的索引：");
                    int deleteIndex = scanner.nextInt();
                    phoneBook.deleteContact(deleteIndex - 1);
                    break;
                case 3: // 修改联系人
                    System.out.println("请输入要修改的联系人的索引：");
                    int modifyIndex = scanner.nextInt();
                    phoneBook.viewContact(modifyIndex - 1);

                    System.out.println("请选择修改后的联系人类型：");
                    System.out.println("1. 家人");
                    System.out.println("2. 朋友");
                    System.out.println("3. 工作联系人");
                    int modifyType = scanner.nextInt();

                    System.out.println("请输入姓名：");
                    String modifyName = scanner.next();
                    System.out.println("请输入电话：");
                    String modifyPhone = scanner.next();
                    System.out.println("请输入备注：");
                    String modifyRemark = scanner.next();

                    if (modifyType == 1) { // 修改家人
                        System.out.println("请输入地址：");
                        String modifyAddress = scanner.next();
                        System.out.println("请输入固定电话：");
                        String modifyHomePhone = scanner.next();
                        Family modifyFamily = new Family(modifyName, modifyPhone, modifyRemark, modifyAddress, modifyHomePhone);
                        phoneBook.modifyContact(modifyIndex - 1, modifyFamily);
                    } else if (modifyType == 2) { // 修改朋友
                        System.out.println("请输入类别：");
                        String modifyCategory = scanner.next();
                        Friend modifyFriend = new Friend(modifyName, modifyPhone, modifyRemark, modifyCategory);
                        phoneBook.modifyContact(modifyIndex - 1, modifyFriend);
                    } else if (modifyType == 3) { // 修改工作联系人
                        System.out.println("请输入公司：");
                        String modifyCompany = scanner.next();
                        System.out.println("请输入部门：");
                        String modifyDepartment = scanner.next();
                        System.out.println("请输入职务：");
                        String modifyPosition = scanner.next();
                        WorkContact modifyWorkContact = new WorkContact(modifyName, modifyPhone, modifyRemark, modifyCompany, modifyDepartment, modifyPosition);
                        phoneBook.modifyContact(modifyIndex - 1, modifyWorkContact);
                    }
                    break;
                case 4: // 查看指定成员
                    System.out.println("请输入要查看的联系人的索引：");
                    int viewIndex = scanner.nextInt();
                    phoneBook.viewContact(viewIndex - 1);
                    break;
                case 5: // 查看所有联系人信息
                    phoneBook.viewAllContacts();
                    break;
                case 6: // 退出程序
                    scanner.close();
                    System.exit(0);
                default:
                    System.out.println("输入的操作不合法，请重新输入！");
                    break;
            }

            System.out.println();
        }
    }
}