Java 通讯录管理系统

Java通讯录管理系统可以有以下功能：

1. 添加联系人：用户可以添加联系人的姓名、电话、电子邮件等信息。

2. 查找联系人：用户可以通过关键字查找已添加的联系人。

3. 修改联系人信息：用户可以修改已添加联系人的信息。

4. 删除联系人：用户可以删除已添加的联系人。

5. 显示联系人列表：用户可以查看已添加的所有联系人。

6. 数据存储：程序需要能够将添加的联系人数据持久化存储。

下面是一个简单的Java通讯录管理系统的代码示例：

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

public class AddressBook {

    private ArrayList<Contact> contacts = new ArrayList<>();

    public void addContact(Contact contact) {
        contacts.add(contact);
        System.out.println("Contact added successfully!");
    }

    public Contact findContact(String keyword) {
        for (Contact contact : contacts) {
            if (contact.getName().contains(keyword) ||
                contact.getPhone().contains(keyword) ||
                contact.getEmail().contains(keyword)) {
                return contact;
            }
        }
        return null;
    }

    public void updateContact(Contact contact) {
        int index = contacts.indexOf(contact);
        if (index >= 0) {
            contacts.set(index, contact);
            System.out.println("Contact updated successfully!");
        } else {
            System.out.println("Contact not found!");
        }
    }

    public void deleteContact(Contact contact) {
        if (contacts.remove(contact)) {
            System.out.println("Contact deleted successfully!");
        } else {
            System.out.println("Contact not found!");
        }
    }

    public void displayContacts() {
        System.out.println("Contact list:");
        for (Contact contact : contacts) {
            System.out.println(contact);
        }
    }

    public void saveContacts() {
        // TODO: implement saving contacts to a file
    }

    public void loadContacts() {
        // TODO: implement loading contacts from a file
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        AddressBook addressBook = new AddressBook();

        while (true) {
            System.out.println("Please select an option:");
            System.out.println("1. Add contact");
            System.out.println("2. Find contact");
            System.out.println("3. Update contact");
            System.out.println("4. Delete contact");
            System.out.println("5. Display contacts");
            System.out.println("6. Exit");

            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    System.out.println("Enter contact name:");
                    String name = scanner.nextLine();
                    System.out.println("Enter contact phone:");
                    String phone = scanner.nextLine();
                    System.out.println("Enter contact email:");
                    String email = scanner.nextLine();
                    Contact contact = new Contact(name, phone, email);
                    addressBook.addContact(contact);
                    break;
                case 2:
                    System.out.println("Enter search keyword:");
                    String keyword = scanner.nextLine();
                    Contact foundContact = addressBook.findContact(keyword);
                    if (foundContact != null) {
                        System.out.println("Contact found:");
                        System.out.println(foundContact);
                    } else {
                        System.out.println("Contact not found!");
                    }
                    break;
                case 3:
                    System.out.println("Enter contact name:");
                    String updateName = scanner.nextLine();
                    System.out.println("Enter contact phone:");
                    String updatePhone = scanner.nextLine();
                    System.out.println("Enter contact email:");
                    String updateEmail = scanner.nextLine();
                    Contact updateContact = new Contact(updateName, updatePhone, updateEmail);
                    addressBook.updateContact(updateContact);
                    break;
                case 4:
                    System.out.println("Enter contact name:");
                    String deleteName = scanner.nextLine();
                    System.out.println("Enter contact phone:");
                    String deletePhone = scanner.nextLine();
                    System.out.println("Enter contact email:");
                    String deleteEmail = scanner.nextLine();
                    Contact deleteContact = new Contact(deleteName, deletePhone, deleteEmail);
                    addressBook.deleteContact(deleteContact);
                    break;
                case 5:
                    addressBook.displayContacts();
                    break;
                case 6:
                    addressBook.saveContacts();
                    System.exit(0);
                    break;
                default:
                    System.out.println("Invalid choice!");
                    break;
            }
        }
    }

}

联系人类：

public class Contact {

    private String name;
    private String phone;
    private String email;

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Name: " + name + ", Phone: " + phone + ", Email: " + email;
    }

}