Java写一个新闻类

  
  1 package com.jredu.ch10;

import java.util.Scanner;

/**
 * 新闻类
 * @author Administrator
 *
 */
public class News {

    private int id;//编号
    private String title;//标题
    private String content;//内容
    private String addUser;//添加人
    private String imgPath;//图片
    private String pubDate;//发布时间
    private boolean isShow;//是否显示
    
    /**
     * 无参构造
     */
    public News(Scanner sc) {
        super();
        System.out.print("请输入新闻编号");
        this.id=sc.nextInt();
        // TODO Auto-generated constructor stub
        init(sc);
    }
    
    /**
     * 带编号的有参构造
     * @param id
     */
    public News(Scanner sc,int id) {
        super();
        // TODO Auto-generated constructor stub
        this.id=id;
        // TODO Auto-generated constructor stub
        init(sc);
    }

    public News(int id, String title, String content, String addUser, String imgPath, String pubDate, boolean isShow) {
        super();
        this.id = id;
        this.title = title;
        this.content = content;
        this.addUser = addUser;
        this.imgPath = imgPath;
        this.pubDate = pubDate;
        this.isShow = isShow;
    }
    
    public void init(Scanner sc) {
        System.out.print("请输入标题");
        this.title=sc.next();
        System.out.print("请输入内容");
        this.content=sc.next();
        System.out.print("请输入发布者");
        this.addUser=sc.next();
        System.out.print("请输入发布时间");
        this.pubDate=sc.next();
        System.out.print("请输入图片路径");
        this.imgPath=sc.next();
        System.out.print("是否显示(y/n)");
        this.isShow=sc.next().equals("y")?true:false;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = 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 getAddUser() {
        return addUser;
    }

    public void setAddUser(String addUser) {
        this.addUser = addUser;
    }

    public String getImgPath() {
        return imgPath;
    }

    public void setImgPath(String imgPath) {
        this.imgPath = imgPath;
    }

    public String getPubDate() {
        return pubDate;
    }

    public void setPubDate(String pubDate) {
        this.pubDate = pubDate;
    }

    public boolean isShow() {
        return isShow;
    }

    public void setShow(boolean isShow) {
        this.isShow = isShow;
    }
    
}

package com.jredu.ch10;
/**
 * 新闻业务类
 * @author Administrator
 *
 */
public class NewsService {
    //所有的新闻
    private News[] news1=new News[100];
    private int index;//新闻的下标
    /**
     * 添加新闻
     * @param news
     * @return 添加新闻成功时，返回true,添加失败时返回false
     */
    public boolean addNews(News news) {
        if(index<news1.length) {
            for(int i=0;i<index;i++) {
                if(news1[i].getId()==news.getId()) {
                    System.out.println("该新闻编号已经存在，无法添加");
                    return false;
                }
            }
            news1[index]=news;
            index++;
            return true;
        }
        return false;
    }
    
    /**
     * 删除新闻
     * @param id
     * @return 当新闻删除成功时，返回true,删除失败时，返回false
     */
    public boolean deleteNews(int id) {
        //循环遍历所有的新闻
        for(int i=0;i<index;i++) {
            //遍历每一条新闻不为空,并且id等于传入的id时
            if(news1[i]!=null&&news1[i].getId()==id) {
                //删除这条新闻
                news1[i]=null;
                return true;
            }
        }
        return false;
    }
    
    /**
     * 更新新闻
     * @param news
     */
    public boolean updateNews(News news) {
        //循环遍历所有的新闻
        for(int i=0;i<index;i++) {
            //遍历每一条新闻不为空,并且id等于传入的id时
            if(news1[i]!=null&&news1[i].getId()==news.getId()) {
                //更新这条新闻
                news1[i]=news;
                return true;
            }
        }
        return false;
    }
    
    /**
     * 显示新闻
     */
    public void showNews() {
        News news=null;
        for(int i=0;i<index;i++) {
            if(news1[i]!=null&&news1[i].isShow()) {
                news=news1[i];
                System.out.println("编号："+news.getId()+"\t标题:"+news.getTitle());
                System.out.println("作者:"+news.getAddUser()+"\t发布时间："+news.getPubDate());
                System.out.println("\t"+news.getContent());
                System.out.println("图片地址："+news.getImgPath());
            }
        }
    }
    
}

package com.jredu.ch10;

import java.util.Scanner;

public class NewsTest {

    public static void main(String[] args) {
        NewsService service=new NewsService();
        Scanner sc=new Scanner(System.in);
        //进入系统，让用户选择功能
        System.out.println("*********欢迎进入新闻管理系统*********");
        while(true) {
            System.out.println("1.添加新闻\t2.删除新闻\t3.更新新闻\t4.查看新闻\tn.退出系统");
            System.out.println("请选择功能");
            String code=sc.next();
            boolean isReturn=false;
            switch(code) {
                //添加新闻
                case "1":
                    News news=new News(sc);
                    boolean isAdd=service.addNews(news);
                    if(!isAdd) {
                        System.out.println("添加新闻失败");
                    }
                    break;
                //删除新闻
                case "2":
                    System.out.print("请输入编号");
                    boolean isDelete=service.deleteNews(sc.nextInt());
                    if(!isDelete) {
                        System.out.println("删除新闻失败");
                    }
                    break;
                //更新新闻
                case "3":
                    System.out.print("请输入编号");
                    News news1=new News(sc,sc.nextInt());
                    boolean isUpdate=service.updateNews(news1);
                    if(!isUpdate) {
                        System.out.println("更新新闻失败");
                    }
                    break;
                //查看新闻
                case "4":
                    service.showNews();
                    break;
                //退出系统
                default:
                    isReturn=true;
                    break;
            }
            if(isReturn) {
                break;
            }
        }
        System.out.println("谢谢使用，再见");
        sc.close();
    }
    
}