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
图书类BooK
package tushu;
public class Book {
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 Book(String id, String name, double price) {
super();
this.id = id;
this.name = name;
this.price = price;
}
public Book() {
super();
}
}
package tushu;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class Test {
static List<Book> listbooks = new ArrayList<Book>();
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
creatBookList();
menu();
}
public static void creatBookList() {
// TODO Auto-generated method stub
Book b1 = new Book("001", "JSP使用教程", 79.0);
listbooks.add(b1);
Book b2 = new Book("002", "JavaScript", 59.8);
listbooks.add(b2);
Book b3 = new Book("003", "MySQL应用教程", 49.8);
listbooks.add(b3);
}
public static void menu() {
for (;;) {
System.out.println("************************");
System.out.println("* 1.添加图书 *");
System.out.println("* 2.修改图书 *");
System.out.println("* 3.删除图书 *");
System.out.println("* 4.查询图书 *");
System.out.println("* 5.退出程序 *");
System.out.println("************************");
int i = inputInt("请选择你的操作:");
switch (i) {
case 1:
addBook();
break;
case 2:
updateBook();
break;
case 3:
delBook();
break;
case 4:
findBook();
break;
case 5:
return;
default:
System.out.println("输入错误,请重新输入");
break;
}
}
}
private static void findBook() {
// TODO Auto-generated method stub
System.out.println("id 图书名称 图书价格");
for (Book book : listbooks) {
System.out.println(book.getId() + " " + book.getName() + " "
+ book.getPrice());
}
}
private static void delBook() {
// TODO Auto-generated method stub
String id = inputStr("请输入要删除图书的id");
for (int i = 0; i < listbooks.size(); i++) {
Book book = listbooks.get(i);
if (id.equals(book.getId())) {
listbooks.remove(i);
}
}
}
private static void updateBook() {
// TODO Auto-generated method stub
String id = inputStr("请输入要修改的图书id");
for (int i = 0; i < listbooks.size(); i++) {
Book book = listbooks.get(i);
if (id.equals(book.getId())) {
book.setName(inputStr("请输入修改后的图书名称："));
book.setPrice(inputDouble("请输入修改后的图书价格"));
listbooks.remove(i);
listbooks.add(i, book);
}
}
}
private static void addBook() {
// TODO Auto-generated method stub
String id = inputStr("请输入要添加的图书id");
String name = inputStr("请输入要添加的图书名称");
double price = inputDouble("请输入要添加的图书价格");
Book book = new Book(id, name, price);
listbooks.add(book);
}
public static String inputStr(String msg) {
System.out.print(msg);
return new Scanner(System.in).nextLine();
}
public static int inputInt(String msg) {
System.out.print(msg);
return new Scanner(System.in).nextInt();
}
public static double inputDouble(String msg) {
System.out.print(msg);
return new Scanner(System.in).nextDouble();
}
}
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="tushu.Book"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'index.jsp' starting page</title> </head> <body> <% List<Book> listbooks = new ArrayList<Book>(); Book b1 = new Book("1", "JSP使用教程", 49.8); listbooks.add(b1); Book b2 = new Book("2", "JavaScript", 59.8); listbooks.add(b2); Book b3 = new Book("3", "MySQL应用教程", 49.8); listbooks.add(b3); for (int i = 0; listbooks != null && i < listbooks.size(); i++) { out.print(listbooks.get(i).getId() + ": " + listbooks.get(i).getName() + " " + listbooks.get(i).getPrice() + "<br>"); } %> </body> </html>
3.在MySQL中创建Book表，里面id,name,price,
用命令实现，
create database books;
use books;
create table book(
id int(10),
name varchar(10),
price float
);
insert into book values('1','我我我我我我我','01.11');
insert into book values('2','book2','22.22');
把20以上的价格修改成18.8
update book set price=18.8 where price>20;
查找所以书
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;
