用java创建新闻实体类 NewsInfo，包含的属性：newsId（新闻编号)、newsTitle（新闻标 题)、newsContent(新闻内容)、newsDate(发布时间);再定义一个测试类 TestNews, 定义如下方法：showAl1News()查询全部新闻addNews（NewsInfo news）添加新闻deleteNews（int newsId）删除新闻。

这是一个属于程序设计的问题，可以回答。下面是Java代码示例：

NewsInfo.java:

public class NewsInfo {
    private int newsId;
    private String newsTitle;
    private String newsContent;
    private Date newsDate;

    public NewsInfo(int newsId, String newsTitle, String newsContent, Date newsDate) {
        this.newsId = newsId;
        this.newsTitle = newsTitle;
        this.newsContent = newsContent;
        this.newsDate = newsDate;
    }

    public int getNewsId() {
        return newsId;
    }

    public void setNewsId(int newsId) {
        this.newsId = newsId;
    }

    public String getNewsTitle() {
        return newsTitle;
    }

    public void setNewsTitle(String newsTitle) {
        this.newsTitle = newsTitle;
    }

    public String getNewsContent() {
        return newsContent;
    }

    public void setNewsContent(String newsContent) {
        this.newsContent = newsContent;
    }

    public Date getNewsDate() {
        return newsDate;
    }

    public void setNewsDate(Date newsDate) {
        this.newsDate = newsDate;
    }
}

TestNews.java:

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

public class TestNews {
    private List<NewsInfo> newsList;

    public TestNews() {
        newsList = new ArrayList<>();
    }

    public void showAllNews() {
        for (NewsInfo news : newsList) {
            System.out.println(news.getNewsId() + " " + news.getNewsTitle() + " " +
                    news.getNewsContent() + " " + news.getNewsDate());
        }
    }

    public void addNews(NewsInfo news) {
        newsList.add(news);
    }

    public void deleteNews(int newsId) {
        for (int i = 0; i < newsList.size(); i++) {
            NewsInfo news = newsList.get(i);
            if (news.getNewsId() == newsId) {
                newsList.remove(i);
                break;
            }
        }
    }

    public static void main(String[] args) {
        TestNews tn = new TestNews();
        tn.addNews(new NewsInfo(1, "News Title 1", "News Content 1", new Date()));
        tn.addNews(new NewsInfo(2, "News Title 2", "News Content 2", new Date()));
        tn.showAllNews();

        tn.deleteNews(1);
        tn.showAllNews();
    }
}