在Java中如何开发简易公告通知系统_公告通知系统项目实战解析

public class Announcement {
    private String id;
    private String title;
    private String content;
    private String author;
    private String publishTime;
<pre class='brush:java;toolbar:false;'>public Announcement(String id, String title, String content, String author, String publishTime) {
    this.id = id;
    this.title = title;
    this.content = content;
    this.author = author;
    this.publishTime = publishTime;
}

// Getter方法（生成toString便于打印）
@Override
public String toString() {
    return "ID: " + id + " | 标题: " + title + " | 作者: " + author + " | 时间: " + publishTime;
}

public String getDetail() {
    return "=== 公告详情 ===\n" +
           "标题: " + title + "\n" +
           "内容: " + content + "\n" +
           "发布人: " + author + "\n" +
           "发布时间: " + publishTime;
}

import java.util.ArrayList;
import java.util.List;
<p>public class AnnouncementService {
private List<Announcement> announcements = new ArrayList<>();
private int counter = 1; // 简易ID生成</p><pre class='brush:java;toolbar:false;'>public void addAnnouncement(String title, String content, String author) {
    String id = "ANN-" + counter++;
    String time = java.time.LocalDateTime.now().toString().substring(0, 19);
    Announcement ann = new Announcement(id, title, content, author, time);
    announcements.add(ann);
    System.out.println("✅ 公告发布成功！ID: " + id);
}

public void listAnnouncements() {
    if (announcements.isEmpty()) {
        System.out.println("? 当前没有公告。");
        return;
    }
    System.out.println("\n? 公告列表：");
    for (int i = announcements.size() - 1; i >= 0; i--) {
        System.out.println(announcements.get(i));
    }
}

public void viewDetail(String id) {
    for (Announcement ann : announcements) {
        if (ann.getId().equals(id)) {
            System.out.println(ann.getDetail());
            return;
        }
    }
    System.out.println("❌ 未找到ID为 " + id + " 的公告。");
}

public void deleteAnnouncement(String id) {
    boolean removed = announcements.removeIf(ann -> ann.getId().equals(id));
    if (removed) {
        System.out.println("?️ 公告 " + id + " 已删除。");
    } else {
        System.out.println("❌ 删除失败，未找到该公告。");
    }
}

import java.util.Scanner;
<p>public class Main {
public static void main(String[] args) {
AnnouncementService service = new AnnouncementService();
Scanner scanner = new Scanner(System.in);
String cmd;</p><pre class='brush:java;toolbar:false;'>    System.out.println("? 欢迎使用简易公告系统");

    while (true) {
        System.out.println("\n--- 操作菜单 ---");
        System.out.println("1. 发布公告");
        System.out.println("2. 查看公告列表");
        System.out.println("3. 查看公告详情");
        System.out.println("4. 删除公告");
        System.out.println("5. 退出");
        System.out.print("请选择: ");
        cmd = scanner.nextLine();

        switch (cmd) {
            case "1":
                System.out.print("标题: "); String t = scanner.nextLine();
                System.out.print("内容: "); String c = scanner.nextLine();
                System.out.print("发布人: "); String a = scanner.nextLine();
                service.addAnnouncement(t, c, a);
                break;
            case "2":
                service.listAnnouncements();
                break;
            case "3":
                System.out.print("输入公告ID: ");
                String id = scanner.nextLine();
                service.viewDetail(id);
                break;
            case "4":
                System.out.print("输入要删除的公告ID: ");
                String delId = scanner.nextLine();
                service.deleteAnnouncement(delId);
                break;
            case "5":
                System.out.println("? 退出系统。");
                scanner.close();
                return;
            default:
                System.out.println("⚠️ 无效输入，请重试。");
        }
    }
}