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`;