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 id, String name, double price) {
            super();
            this.id = id;
            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", " JavaScript     ", 59.8);
            listbooks.add(b1);
            Book b2 = new Book("2", " Android移动应用    ", 49.9);
            listbooks.add(b2);
            Book b3 = new Book("3", " 信息系统分析与设计", 49.8);
            listbooks.add(b3);
        }

        public static void menu() {
            for (;;) {
                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");
                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="com.gd.entity.Book"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
</head>

<body>
    <%
        List<Book> list = new ArrayList<Book>();
        Book b1=new Book(1 "JavaScript     " 59.8);
        Book b2=new Book(2 "Android移动应用 " 49.9);
        Book b3=new Book(3 "信息系统分析与设计" 49.8);
        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