JSP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

package com.cn;

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

public class books {
    private String id;
    private String name;
    private double price;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public double getPrice() {
        return price;
    }
    public void setPrice(double price) {
        this.price = price;
    }
    public books(String id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
}
package com.cn;

public class booksbest {
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        books b1=new  books("a","aa",10);
        books b2=new  books("b","bb",20);
        books b3=new  books("c","cc",30);
        books b4=new  books("d","dd",40);
        books b=new books();
        b.add(b1);
        b.add(b2);
        b.add(b3);
        b.showAll();
        b.set(b4, 0);
        System.out.println("==============");
        b.showAll();
        System.out.println("==============");
        b.remove(b4);
        b.showAll();
 
    }
 
}

 

 

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 language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
  <head>
  </head>
   <%@ page import="books.book" %>
  <body>
     <%
       List<book> list=new ArrayList<book>();
          book b1=new book();
          b1.setId("a");
         b1.setName("中华小当家");
          b1.setPrice(10);
          book b2=new book();
          b2.setId("b");
         b2.setName("三国演义");
          b2.setPrice(20);
          list.add(b1);
         list.add(b2);
       for(int i=0;i<list.size();i++){
            out.print("ID:"+list.get(i).getId()+",NAME:"+list.get(i).getName()+",PRICE:"+list.get(i).getPrice()+"<br>");
        }
   %>
    
  </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 17:33  我什么时候能有只猫  阅读(12)  评论(0编辑  收藏  举报