3.电话簿管理系统(难度系数**) 3.1问题描述 设计并实现一个管理电话簿的管理系统，数据信息文本文件存储，也可以采 用数据库存储。 3.2基本要求 以联系人为单位，管理联系人姓名、单位名称、移动电话、固定电话、办公 电话、分组等信息。 提供便利的查询功能，输入联系人名称或单位名称或分组信息，能查找出相 应联系人的联络信息。 根据功能要求，设计数据结构和界面，完成程序设计。，用java写

好的，我明白了你的问题。这是一个电话簿管理系统的设计与实现，要求使用文本文件或数据库存储数据，并且提供便利的查询功能。以下是一个简单的Java代码示例，实现这个电话簿管理系统的基本要求：

import java.io.*;
import java.util.*;

class Contact {
    private String name;
    private String company;
    private String mobile;
    private String home;
    private String office;
    private String group;

    public Contact(String name, String company, String mobile, String home, String office, String group) {
        this.name = name;
        this.company = company;
        this.mobile = mobile;
        this.home = home;
        this.office = office;
        this.group = group;
    }

    public String getName() {
        return name;
    }

    public String getCompany() {
        return company;
    }

    public String getMobile() {
        return mobile;
    }

    public String getHome() {
        return home;
    }

    public String getOffice() {
        return office;
    }

    public String getGroup() {
        return group;
    }
}

class Phonebook {
    private ArrayList<Contact> contacts = new ArrayList<>();

    public void addContact(Contact c) {
        contacts.add(c);
    }

    public void removeContact(Contact c) {
        contacts.remove(c);
    }

    public ArrayList<Contact> searchContacts(String query) {
        ArrayList<Contact> results = new ArrayList<>();
        for (Contact c : contacts) {
            if (c.getName().toLowerCase().contains(query.toLowerCase()) ||
                c.getCompany().toLowerCase().contains(query.toLowerCase()) ||
                c.getGroup().toLowerCase().contains(query.toLowerCase())) {
                results.add(c);
            }
        }
        return results;
    }

    public static Phonebook loadFromFile(String filename) throws IOException {
        Phonebook pb = new Phonebook();
        BufferedReader br = new BufferedReader(new FileReader(filename));
        String line;
        while ((line = br.readLine()) != null) {
            String[] parts = line.split(",");
            pb.addContact(new Contact(parts[0], parts[1], parts[2], parts[3], parts[4], parts[5]));
        }
        br.close();
        return pb;
    }

    public void saveToFile(String filename) throws IOException {
        BufferedWriter bw = new BufferedWriter(new FileWriter(filename));
        for (Contact c : contacts) {
            bw.write(c.getName() + "," + c.getCompany() + "," + c.getMobile() + "," + c.getHome() + "," + c.getOffice() + "," + c.getGroup());
            bw.newLine();
        }
        bw.close();
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        Phonebook pb = Phonebook.loadFromFile("phonebook.txt");
        while (true) {
            System.out.println("1. Add contact");
            System.out.println("2. Remove contact");
            System.out.println("3. Search contacts");
            System.out.println("4. Save and exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();
            scanner.nextLine();
            switch (choice) {
                case 1:
                    System.out.print("Enter name: ");
                    String name = scanner.nextLine();
                    System.out.print("Enter company: ");
                    String company = scanner.nextLine();
                    System.out.print("Enter mobile phone: ");
                    String mobile = scanner.nextLine();
                    System.out.print("Enter home phone: ");
                    String home = scanner.nextLine();
                    System.out.print("Enter office phone: ");
                    String office = scanner.nextLine();
                    System.out.print("Enter group: ");
                    String group = scanner.nextLine();
                    pb.addContact(new Contact(name, company, mobile, home, office, group));
                    break;
                case 2:
                    System.out.print("Enter name of contact to remove: ");
                    String nameToRemove = scanner.nextLine();
                    ArrayList<Contact> results = pb.searchContacts(nameToRemove);
                    if (results.size() == 0) {
                        System.out.println("Contact not found.");
                    } else if (results.size() == 1) {
                        pb.removeContact(results.get(0));
                        System.out.println("Contact removed.");
                    } else {
                        System.out.println("Multiple contacts found. Please choose one to remove:");
                        for (int i = 0; i < results.size(); i++) {
                            System.out.println((i+1) + ". " + results.get(i).getName());
                        }
                        int indexToRemove = scanner.nextInt() - 1;
                        pb.removeContact(results.get(indexToRemove));
                        System.out.println("Contact removed.");
                        scanner.nextLine();
                    }
                    break;
                case 3:
                    System.out.print("Enter search query: ");
                    String query = scanner.nextLine();
                    ArrayList<Contact> searchResults = pb.searchContacts(query);
                    System.out.println(searchResults.size() + " results found:");
                    for (Contact c : searchResults) {
                        System.out.println(c.getName() + " (" + c.getCompany() + ")");
                        System.out.println("Mobile: " + c.getMobile());
                        System.out.println("Home: " + c.getHome());
                        System.out.println("Office: " + c.getOffice());
                        System.out.println("Group: " + c.getGroup());
                        System.out.println();
                    }
                    break;
                case 4:
                    pb.saveToFile("phonebook.txt");
                    System.out.println("Phonebook saved. Goodbye!");
                    return;
                default:
                    System.out.println("Invalid choice. Please try again.");
                    break;
            }
        }
    }
}

这个程序使用了两个类，`Contact` 和 `Phonebook`。`Contact` 类表示一个联系人，包含姓名、单位名称、移动电话、固定电话、办公电话和分组等信息。`Phonebook` 类表示一个电话簿，包含多个联系人。它具有添加、删除、搜索和保存功能。程序的主要逻辑在 `main` 函数中，它使用一个循环来读取用户输入的选项，并执行相应的操作。其中，搜索功能是根据用户输入的查询字符串，从电话簿中查找匹配的联系人，并返回一个包含这些联系人的 `ArrayList` 对象。这个程序使用了文件 `phonebook.txt` 来存储联系人信息，它使用逗号分隔符来分隔不同的字段。你可以根据自己的需求修改这个文件格式，或者使用一个数据库来存储数据。