第九周作业

1.做一个图书类Book id,name,price ,get,set访问器,构造方法2个,1个无参,1个有参
做一个测试类,在main中创建3个图书对象,放到list集合中。做一个菜单,可以添加,删除,修改,查询

Book.java:

package
work; public class Book { private Integer id; private String name; private Integer price; public Book(Integer id, String name, Integer price) { super(); this.id = id; this.name = name; this.price = price; } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getPrice() { return price; } public void setPrice(Integer price) { this.price = price; } public Book(){ super(); } public String toString() { return "book [id=" + id + ", name=" + name + ", price=" + price + "]"; } }
test.java:

package
work; import java.util.List; import java.util.ArrayList; import java.util.Scanner; public class test { static java.util.List<Book> list=new ArrayList<Book>(); static{ Book book1=new Book(1,"十宗罪",30); Book book2=new Book(2,"法医秦明",25); Book book3=new Book(3,"第十一根手指",31); list.add(book1); list.add(book2); list.add(book3); } public static void main(String[] args) { while(true){ System.out.println("1.添加"); System.out.println("2.删除"); System.out.println("3.修改"); System.out.println("4.查询"); System.out.println("5.退出"); System.out.println("请选择"); Scanner scanner=new Scanner(System.in); int a=scanner.nextInt(); switch (a) { case 1: add(); break; case 2: del(); break; case 3: change(); break; case 4: search(); break; case 5: System.out.println("退出成功"); return; } } } private static void search(){ for(Book book4:list){ System.out.println(book4); } } private static void change(){ System.out.println("请输入需要修改的图书编号"); int update=new Scanner(System.in).nextInt(); for(Book book:list){ if(update==book.getId()){ System.err.println("请输入书名"); String name1=new Scanner(System.in).next(); System.err.println("请输入价格"); int price1=new Scanner(System.in).nextInt(); book.setName(name1); book.setPrice(price1); System.out.println("修改成功"); } } } private static void del(){ System.out.println("请输入删除的图书编号"); int id=new Scanner(System.in).nextInt(); try{ for(Book book:list){ if(list.size()!=0){ if(id==book.getId()){ list.remove(book); System.out.println("删除成功"); } } } }catch(Exception e){ } } private static void add(){ Scanner scanner=new Scanner(System.in); System.err.println("请输入编号"); int idd=scanner.nextInt(); System.err.println("请输入书名"); String name2=scanner.next(); System.err.println("请输入价格"); int price2=scanner.nextInt(); Book book=new Book(idd,name2,price2); list.add(book); System.out.println("添加成功"); } }

 

 2.上题的类,在一个JSP页面中,创建一个集合,里面放3个图书,集合循环遍历显示在页面上。

<%@page import="work.Book" %>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <%
  List<Book> list =new ArrayList<Book>();
   Book book1 =new Book(1,"把自己当回事",10);
   list.add(book1);
    Book book2 =new Book(2,"三十而立",20);
   list.add(book2);
    Book book3 =new Book(3,"余生请多指教",30);
   list.add(book3);
    for (Book book4 : list) {
            out.print(book4+"<br>");
    }
  %>
  <body>
  </body>
</html>

 

 

3.在MySQL中创建Book表,里面id,name,price,
用命令实现,

添加一个图书,

 

 


根据名称删除图书,

 

 


把所有名称是“我”开头的图书删除,
删除全部图书,


把20元以上的图书价格都修改为18.8,

 

 

查看全部图书,

 

 

 


查看价格高于10块钱的全部图书

 

posted @ 2022-05-01 17:40  好多鱼好多鱼好剩余  阅读(16)  评论(0编辑  收藏  举报