Java List集合使用方法介绍（2）——公告管理

Javaimport java.util.Date;public class Notice {    private int id;// ID    private String title;// 标题    private String creator;// 创建人    private Date createTime;// 创建时间    public Notice(int id, String title, String creator, Date createTime) {        super();        this.id = id;        this.title = title;        this.creator = creator;        this.createTime = createTime;    }    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 getCreator() {        return creator;    }    public void setCreator(String creator) {        this.creator = creator;    }    public Date getCreateTime() {        return createTime;    }    public void setCreateTime(Date createTime) {        this.createTime = createTime;    }}

Javaimport java.util.ArrayList;import java.util.Date;public class NoticeTest {    public static void main(String[] args) {        // 创建Notice类的对象，生成三条公告        Notice notice1 = new Notice(1, "欢迎来到慕课网！", "管理员", new Date());        Notice notice2 = new Notice(2, "请同学们按时提交作业！", "老师", new Date());        Notice notice3 = new Notice(3, "考勤通知！", "老师", new Date());        // 添加公告        ArrayList noticeList = new ArrayList();        noticeList.add(notice1);        noticeList.add(notice2);        noticeList.add(notice3);        // 显示公告        System.out.println("公告的内容为：");        for (int i = 0; i < noticeList.size(); i++) {            System.out.println(i + 1 + ":" + ((Notice) (noticeList.get(i))).getTitle());        }        System.out.println("***********************************");        // 在第一条公告后面添加一条新公告        Notice notice4 = new Notice(4, "在线编辑器可以使用啦！", "管理员", new Date());        noticeList.add(1, notice4);        // 显示公告        System.out.println("公告的内容为：");        for (int i = 0; i < noticeList.size(); i++) {            System.out.println(i + 1 + ":" + ((Notice) (noticeList.get(i))).getTitle());        }        // 删除按时完成作业的公告        noticeList.remove(2);        System.out.println("删除公告后的内容为：");        for (int i = 0; i < noticeList.size(); i++) {            System.out.println(i + 1 + ":" + ((Notice) (noticeList.get(i))).getTitle());        }        // 将第二条公告改为：Java在线编辑器可以使用啦！        System.out.println("***********************************");        notice4.setTitle("Java在线编辑器可以使用啦！");        System.out.println("修改后：");        for (int i = 0; i < noticeList.size(); i++) {            System.out.println(i + 1 + ":" + ((Notice) (noticeList.get(i))).getTitle());        }    }}