public class Article {
    private String title;
    private String url;
    private String content;
    private long timestamp;

    public Article(String title, String url) {
        if (title == null || title.trim().isEmpty()) {
            throw new IllegalArgumentException("标题不能为空");
        }
        if (url == null || url.trim().isEmpty()) {
            throw new IllegalArgumentException("URL不能为空");
        }
        this.title = title;
        this.url = url;
        this.timestamp = System.currentTimeMillis();
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        if (title == null || title.trim().isEmpty()) {
            throw new IllegalArgumentException("标题不能为空");
        }
        this.title = title;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        if (url == null || url.trim().isEmpty()) {
            throw new IllegalArgumentException("URL不能为空");
        }
        this.url = url;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(long timestamp) {
        this.timestamp = timestamp;
    }

    @Override
    public String toString() {
        return "Article{" +
                "title='" + title + '\'' +
                ", url='" + url + '\'' +
                ", timestamp=" + timestamp +
                '}';
    }
}