259 lines
8.9 KiB
Java
259 lines
8.9 KiB
Java
package addressbook;
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import java.util.*;
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/**
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* 第 7 天综合项目 —— 命令行通讯录
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*
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* 综合运用本周所学：
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* 1. 类与对象（Contact 内部类）
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* 2. 封装（private 属性 + getter/setter）
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* 3. 集合框架（HashMap 存储，ArrayList 排序）
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* 4. 流程控制（while 菜单循环 + switch 分支）
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* 5. 异常处理（try-catch）
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* 6. 方法封装（每个功能一个方法）
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*/
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public class AddressBookApp {
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private static final Scanner scanner = new Scanner(System.in);
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// 核心数据结构：以姓名为 key，Contact 对象为 value
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private static final Map<String, Contact> contacts = new LinkedHashMap<>();
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// LinkedHashMap 保持插入顺序，方便"查看全部"时有序展示
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public static void main(String[] args) {
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System.out.println("============================================");
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System.out.println(" 📒 命令行通讯录 v1.0");
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System.out.println(" 你的第一个 Java 项目！");
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System.out.println("============================================");
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// 预置几条测试数据，方便快速体验
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initSampleData();
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// 主循环
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while (true) {
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printMenu();
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int choice = readChoice();
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if (!executeChoice(choice)) {
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break; // 用户选择退出
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}
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}
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}
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// ==================== 菜单 ====================
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static void printMenu() {
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System.out.println("\n-----------------------------------------");
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System.out.println(" 1. 添加联系人");
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System.out.println(" 2. 查看全部联系人");
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System.out.println(" 3. 搜索联系人");
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System.out.println(" 4. 修改联系人");
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System.out.println(" 5. 删除联系人");
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System.out.println(" 6. 退出");
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System.out.println("-----------------------------------------");
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System.out.print("请输入你的选择 (1-6): ");
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}
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static int readChoice() {
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try {
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return scanner.nextInt();
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} catch (InputMismatchException e) {
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scanner.nextLine(); // 清掉无效输入
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return -1;
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}
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}
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/** @return false 表示用户选择了退出 */
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static boolean executeChoice(int choice) {
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scanner.nextLine(); // 清除换行符（nextInt 不会消耗换行符）
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switch (choice) {
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case 1 -> addContact();
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case 2 -> listContacts();
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case 3 -> searchContact();
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case 4 -> updateContact();
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case 5 -> deleteContact();
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case 6 -> {
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System.out.println("\n再见！👋");
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scanner.close();
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return false;
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}
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default -> System.out.println("⚠ 无效选项，请输入 1-6。");
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}
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return true;
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}
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// ==================== CRUD 操作 ====================
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/** 1. 添加联系人 */
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static void addContact() {
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System.out.println("\n--- 添加联系人 ---");
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String name = readInput("姓名: ");
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// 校验：姓名不能为空
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if (name.trim().isEmpty()) {
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System.out.println("⚠ 姓名不能为空！");
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return;
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}
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// 校验：不允许重名（HashMap 的 key 唯一）
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if (contacts.containsKey(name)) {
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System.out.println("⚠ 联系人 [" + name + "] 已存在！如需修改请选择功能 4。");
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return;
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}
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String phone = readInput("电话: ");
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String email = readInput("邮箱: ");
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String address = readInput("地址: ");
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Contact c = new Contact(name, phone, email, address);
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contacts.put(name, c);
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System.out.println("✅ 联系人 [" + name + "] 已添加！");
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}
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/** 2. 查看全部联系人 */
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static void listContacts() {
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System.out.println("\n--- 全部联系人 ---");
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if (contacts.isEmpty()) {
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System.out.println("通讯录为空，快去添加第一个联系人吧！");
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return;
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}
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// 打印表头
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System.out.printf("%-4s %-12s %-16s %-20s %-20s\n", "序号", "姓名", "电话", "邮箱", "地址");
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System.out.println("---- ------------ ---------------- -------------------- --------------------");
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int index = 1;
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for (Contact c : contacts.values()) {
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System.out.printf("%-4d %-12s %-16s %-20s %-20s\n",
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index++, c.name, c.phone, c.email, c.address);
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}
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System.out.println("\n共 " + contacts.size() + " 个联系人。");
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}
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/** 3. 搜索联系人（支持姓名精确搜索，以及姓名/电话的模糊搜索） */
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static void searchContact() {
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System.out.println("\n--- 搜索联系人 ---");
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String keyword = readInput("请输入搜索关键词（支持姓名或电话的模糊匹配）: ").trim();
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if (keyword.isEmpty()) {
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System.out.println("⚠ 搜索关键词不能为空！");
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return;
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}
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List<Contact> results = new ArrayList<>();
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for (Contact c : contacts.values()) {
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if (c.name.contains(keyword) || c.phone.contains(keyword)) {
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results.add(c);
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}
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}
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if (results.isEmpty()) {
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System.out.println("未找到匹配的联系人。");
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} else {
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System.out.println("\n找到 " + results.size() + " 条记录：");
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for (Contact c : results) {
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System.out.println(c);
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}
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}
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}
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/** 4. 修改联系人 */
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static void updateContact() {
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System.out.println("\n--- 修改联系人 ---");
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String name = readInput("请输入要修改的联系人姓名: ").trim();
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Contact target = contacts.get(name);
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if (target == null) {
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System.out.println("⚠ 未找到联系人 [" + name + "]。");
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return;
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}
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System.out.println("当前信息：" + target);
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System.out.println("（直接回车保留原值，输入新值则更新）");
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String newPhone = readInput("新电话 [" + target.phone + "]: ");
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if (!newPhone.trim().isEmpty()) {
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target.setPhone(newPhone);
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}
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String newEmail = readInput("新邮箱 [" + target.email + "]: ");
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if (!newEmail.trim().isEmpty()) {
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target.setEmail(newEmail);
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}
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String newAddress = readInput("新地址 [" + target.address + "]: ");
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if (!newAddress.trim().isEmpty()) {
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target.setAddress(newAddress);
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}
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System.out.println("✅ 联系人 [" + name + "] 已更新！");
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}
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/** 5. 删除联系人 */
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static void deleteContact() {
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System.out.println("\n--- 删除联系人 ---");
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String name = readInput("请输入要删除的联系人姓名: ").trim();
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if (!contacts.containsKey(name)) {
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System.out.println("⚠ 未找到联系人 [" + name + "]。");
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return;
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}
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// 二次确认
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System.out.print("确认删除 [" + name + "]？(y/n): ");
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String confirm = scanner.nextLine().trim().toLowerCase();
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if ("y".equals(confirm) || "yes".equals(confirm)) {
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contacts.remove(name);
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System.out.println("✅ 联系人 [" + name + "] 已删除！");
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} else {
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System.out.println("已取消删除。");
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}
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}
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// ==================== 工具方法 ====================
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/** 打印提示并读取一行输入 */
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static String readInput(String prompt) {
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System.out.print(prompt);
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return scanner.nextLine();
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}
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/** 预置示例数据 */
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static void initSampleData() {
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contacts.put("张三", new Contact("张三", "13800138001", "zhangsan@mail.com", "北京市朝阳区"));
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contacts.put("李四", new Contact("李四", "13900139002", "lisi@mail.com", "上海市浦东新区"));
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contacts.put("王五", new Contact("王五", "13700137003", "wangwu@mail.com", "广州市天河区"));
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}
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}
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// ==================== Contact 实体类 ====================
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class Contact {
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String name;
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String phone;
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String email;
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String address;
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public Contact(String name, String phone, String email, String address) {
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this.name = name;
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this.phone = phone;
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this.email = email;
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this.address = address;
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}
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// Getter / Setter（体现封装）
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public String getName() { return name; }
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public String getPhone() { return phone; }
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public void setPhone(String phone) { this.phone = phone; }
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public String getEmail() { return email; }
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public void setEmail(String email) { this.email = email; }
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public String getAddress() { return address; }
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public void setAddress(String address) { this.address = address; }
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@Override
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public String toString() {
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return String.format("[%s] 电话:%s 邮箱:%s 地址:%s", name, phone, email, address);
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}
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}
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