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
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 + "]"; } }
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,"安徒生童话",15.0); Book b2=new Book(2,"马化腾全传",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="l1.Book"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> <% List<Book> list = new ArrayList<Book>(); Book b1=new Book(1,"安徒生童话",15.0); Book b2=new Book(2,"马化腾全传",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
在MySQL中创建Book表，里面id,name,price create table book( -> id int(10) auto_increment primary key, -> name varchar(50), -> price double(5,1)); 添加5个图书 insert into Book(id,name,price)values(1,"我们仨",20); insert into Book(id,name,price)values(2,"西游记",30); insert into Book(id,name,price)values(3,"水浒传",30); insert into Book(id,name,price)values(4,"三国演义",30); insert into Book(id,name,price)values(5,"红楼梦",30); 把20元以上的图书价格都修改为18.8， update book set price=18.8 where price>20; 查看全部图书 select * from book; 查看价格高于10块的全部图书 select * from book where price>10; 把所有名称是“我”开头的图书删除 delete from book where name like '我%'; 删除全部图书 delete from book;
