第九周
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 text;
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 string, String name, double price) {
super();
this.id = string;
this.name = name;
this.price = price;
}
public Book() {
super();
}
}
package text;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class BookTest {
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("1.", " VB ", 39.9);
listbooks.add(b1);
Book b2 = new Book("2.", " VS ", 59.9);
listbooks.add(b2);
Book b3 = new Book("3.", " C++ ", 49.9);
listbooks.add(b3);
Book b4 = new Book("4.", " java", 69.9);
listbooks.add(b4);
}
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 a = inputInt("请选择操作：");
switch (a) {
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="BookMan.Book" %>
</head>
<body>
<%
ArrayList<Book> list=new ArrayList<Book>();
Book book1=new Book(1,"钢铁是怎样炼成的",43);
Book book2=new Book(2,"海底两万里",44.5);
Book book3=new Book(3,"Java",54.2);
list.add(book1);
list.add(book2);
list.add(book3);
for(Book book:list){
out.println(book);
}
%>
</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
DROP TABLE IF EXISTS `book`; CREATE TABLE `book` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '图书编号', `name` varchar(25) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '图书名称', `price` decimal(10, 2) NOT NULL COMMENT '图书价格', PRIMARY KEY (`id`) USING BTREE ); INSERT INTO `book` VALUES (1, '图书一', 50.90); INSERT INTO `book` VALUES (2, '图书二', 40.50); INSERT INTO `book` VALUES (3, '图书三', 45.90); INSERT INTO `book` VALUES (4, '图书四', 20.00); UPDATE `book` SET `price`=18.8 WHERE `price`>20; SELECT * FROM `book`; SELECT * FROM `book` WHERE `price`>10; DELETE FROM `book` WHERE `name` LIKE '我%'; DELETE FROM `book`;
