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 a;

public class Book {
     private Integer id;
          private String name;
          private double price;
          
          public Book() {
              super();
             // TODO Auto-generated constructor stub
         }
     
         public Book(Integer id, String name, double 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 double getPrice() {
             return price;
         }
     
         public void setPrice(double price) {
             this.price = price;
         }
     
         @Override
         public String toString() {
             return "Book [id=" + id + ", name=" + name + ", price=" + price + "]";
         }
     
         
         
     }

package a;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
 
 public class TestBook {
 
     /**
      * @param args
      */
     public static void main(String[] args) {
         List<Book> list = new ArrayList<Book>();
         Book book = new Book();
         Book b1=new Book(1,"格林童话",15.0);
         Book b2=new Book(2,"王健林全传",20.5);
         Book b3=new Book(3,"马云全传",50.00);
         list.add(b1);
         list.add(b2);
         list.add(b3);
         menu(list, book);
         
     }
     public static void menu(List<Book> list, Book book){
         System.out.println("1.添加图书");
         System.out.println("2.删除图书");
         System.out.println("3.修改图书");
         System.out.println("4.查询图书");
         System.out.println("请选择");
         select(list, book);
             
     }
     public static void select(List<Book> list, Book book) {
         int i = new Scanner(System.in).nextInt();
         switch (i) {
         case 1:
             System.out.println("请添加图书的编号：");
             book.setId(new Scanner(System.in).nextInt());
             System.out.println("请添加图书的名称：");
             book.setName(new Scanner(System.in).next());
             System.out.println("请添加图书的价格：");
             book.setPrice(new Scanner(System.in).nextDouble());
             list.add(book);
             System.out.println("添加成功");
             menu(list, book);
 
             break;
         case 2:
             System.out.println("请输入要删除图书的名称：");
             String name=new Scanner(System.in).next();
             for (int j = 0; list != null && j < list.size(); j++) {
                 if (list.get(j).getName().equals(name)) {
                     list.remove(j);
                 }
             }
             System.out.println("删除成功");
             menu(list, book);
             break;
         case 3:
             System.out.println("请输入要修改图书的编号：");
             int k=new Scanner(System.in).nextInt();;
             for (int j = 0; list != null && j < list.size(); j++) {
                 if (list.get(j).getId().equals(k)) {
                     list.remove(j);
                     System.out.println("请输入修改后图书的名称：");
                     String name1=new Scanner(System.in).next();
                     System.out.println("请输入修改后图书的价格：");
                     double price1=new Scanner(System.in).nextDouble();
                     Book b=new Book(k,name1,price1);
                     list.add(b);
                     break;
                 }
             }
             System.out.println("修改成功");
             menu(list, book);
             break;
 
         case 4:
             for (int j = 0; list != null && j < list.size(); j++) {
                 System.out.println(list.get(j).getId() + "."
                         + list.get(j).getName() + "," + list.get(j).getPrice());
             }
             menu(list, book);
             break;
         }
     }
 
 }

 

 

 

  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"%>
<%@page import="a.Book"%>
  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
  <html>
  <head>
  </head>
  
  <body>
    <%
         List<Book> list = new ArrayList<Book>();
         Book b1=new Book(1,"格林童话",15.0);
         Book b2=new Book(2,"王健林全传",20.5);
         Book b3=new Book(3,"马云全传",50.00);
         list.add(b1);
         list.add(b2);
         list.add(b3);
         for (int i = 0; list != null && i < list.size(); i++) {
             out.print(list.get(i).getId() + "." + list.get(i).getName()
                     + "," + 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