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 BookPackage;

public class Book {
    int id;
    String name;
    double price;
    public Book() {
        super();
    }
    public Book(int id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
    
    public int getId() {
        return id;
    }
    public void setId(int 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;
    }
}

package BookPackage;
import java.util.ArrayList;
import java.util.Scanner;

public class main {
    static ArrayList<Book> booklist=new ArrayList<Book>();
    static Scanner sc=new Scanner(System.in);
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Book book1=new Book(100,"三国演义",20);
        Book book2=new Book(200,"红楼梦",30);
        Book book3=new Book(300,"水浒传",10);
        
        booklist.add(book1);
        booklist.add(book2);
        booklist.add(book3);
        
        for (int i = 0; i <booklist.size(); i++) {
            Book b= booklist.get(i);
            System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice());
        }
        System.out.println("===========================");
        shouye();

    }
    
    public static void shouye() {
        System.out.println("请输入你需要的选项：");
        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("===========================");
        caidan();
    }
    
    public static void caidan() {
        int num=sc.nextInt();
        switch (num) {
        case 1:
            tianjia();
            break;
        case 2:
            shanchu();
            break;
        case 3:
            xiugai();
            break;
        case 4:
            chaxun();
            break;
        default:
            break;
        }
    }

    private static void chaxun() {
        // TODO Auto-generated method stub
        System.out.println("请输入要查询图书名称：");
        String bookname=sc.next();
        for (int i = 0; i < booklist.size(); i++) {
            if(booklist.get(i).getName().equals(bookname)){
                System.out.println("===========================");
                Book b= booklist.get(i);
                System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice());
            }
        }
    }

    private static void xiugai() {
        // 修改图书信息
        System.out.println("请输入要修改的图书id：");
        int bookid=sc.nextInt();
        for (int i = 0; i < booklist.size(); i++) {
            if(booklist.get(i).getId()==bookid){
                booklist.remove(i);
                System.out.println("请输入新的图书编号：");
                int id=sc.nextInt();
                System.out.println("请输入新的图书名称：");
                String name=sc.next();
                System.out.println("请输入新的图书价格：");
                double price=sc.nextDouble();
                Book newbook=new Book(id,name,price);
                booklist.add(newbook);
            }
        }
        System.out.println("图书信息修改完成！");
        System.out.println("===========================");
        mulu();
        shouye();
    }

    private static void shanchu() {
        // 删除图书
        System.out.println("请输入要删除的图书名称：");
        String bookname=sc.next();
        for (int i = 0; i < booklist.size(); i++) {
            if(booklist.get(i).getName().equals(bookname)){
                booklist.remove(i);
            }
        }
        System.out.println("删除成功！");
        System.out.println("===========================");
        mulu();
        shouye();
    }

    private static void tianjia() {
        //添加图书
        System.out.println("请输入图书编号：");
        int id=sc.nextInt();
        System.out.println("请输入图书名称：");
        String name=sc.next();
        System.out.println("请输入图书价格：");
        double price=sc.nextDouble();
        Book newbook=new Book(id,name,price);
        booklist.add(newbook);
        System.out.println("新图书添加完成！");
        System.out.println("===========================");
        mulu();
        shouye();
    }

    private static void mulu() {
        // 更新后图书目录
        for (int i = 0; i <booklist.size(); i++) {
            Book b= booklist.get(i);
            System.out.println("图书编号："+b.getId()+"，图书名称："+b.getName()+"，图书价格"+b.getPrice());
        }
        System.out.println("===========================");
    }
}

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