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
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`;
