Java开发简单论坛帖子管理方法

public class Post {
    private int id;
    private String title;
    private String content;
    private String author;
    private long createTime;

    public Post(int id, String title, String content, String author) {
        this.id = id;
        this.title = title;
        this.content = content;
        this.author = author;
        this.createTime = System.currentTimeMillis();
    }

    // Getter 和 Setter 方法
    public int getId() { return id; }
    public String getTitle() { return title; }
    public void setTitle(String title) { this.title = title; }
    public String getContent() { return content; }
    public void setContent(String content) { this.content = content; }
    public String getAuthor() { return author; }
    public long getCreateTime() { return createTime; }

    @Override
    public String toString() {
        return "Post{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", content='" + content + '\'' +
                ", author='" + author + '\'' +
                ", createTime=" + new java.util.Date(createTime) +
                '}';
    }
}

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class PostService {
    private List posts = new ArrayList<>();
    private int nextId = 1;

    // 添加新帖子
    public Post createPost(String title, String content, String author) {
        Post post = new Post(nextId++, title, content, author);
        posts.add(post);
        return post;
    }

    // 获取所有帖子
    public List getAllPosts() {
        return new ArrayList<>(posts);
    }

    // 根据ID查找帖子
    public Optional getPostById(int id) {
        return posts.stream().filter(p -> p.getId() == id).findFirst();
    }

    // 更新帖子
    public boolean updatePost(int id, String title, String content) {
        return getPostById(id).map(post -> {
            post.setTitle(title);
            post.setContent(content);
            return true;
        }).orElse(false);
    }

    // 删除帖子
    public boolean deletePost(int id) {
        return posts.removeIf(post -> post.getId() == id);
    }
}

public class Main {
    public static void main(String[] args) {
        PostService service = new PostService();

        // 发布两个帖子
        service.createPost("第一次发帖", "大家好，这是我的第一个帖子！", "张三");
        service.createPost("Java学习", "求推荐Java入门书籍", "李四");

        // 查看所有帖子
        service.getAllPosts().forEach(System.out::println);

        // 修改帖子
        service.updatePost(1, "更新标题", "内容也更新了");

        // 查询单个帖子
        service.getPostById(1).ifPresent(System.out::println);

        // 删除帖子
        service.deletePost(2);
        System.out.println("删除后剩余帖子数：" + service.getAllPosts().size());
    }
}