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

package housework;

public class Book {
    private String id;
    private String name;
    private double price;
    //生成getters和setters
    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;
    }
    //有参构造
    public Book(String id, String name, double price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
    //无参构造
    public Book() {
        super();
    }
    
    

}

　　

package housework;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

import com.sun.org.apache.bcel.internal.generic.Select;

public class test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        List<Book> list = new ArrayList<Book>();
        Book book = new Book();
        Book book1 = new Book("001", "jsp实用教程", 45.88);
        Book book2 = new Book("002", "C程序设计", 59.80);
        Book book3 = new Book("003", "软件测试技术", 52.60);
        list.add(book1);
        list.add(book2);
        list.add(book3);
        show(list, book);

    }

    public static void show(List<Book> list, Book book) {
        System.out.println("1.添加图书");
        System.out.println("2.查询图书");
        System.out.println("3.修改图书");
        System.out.println("4.删除图书");
        System.out.println("请选择你想要的操作");
        System.out.println("========================");
        select(list, book);
    }

    public static void select(List<Book> list, Book book) {
        int i = new Scanner(System.in).nextInt();
        switch (i) {
        case 1:
            System.out.println("请输入添加的图书编号");
            book.setId(new Scanner(System.in).next());
            System.out.println("请输入添加的图书名称");
            book.setName(new Scanner(System.in).next());
            System.out.println("请输入添加的图书价格");
            book.setPrice(new Scanner(System.in).nextDouble());
            list.add(book);
            System.out.println("添加成功");
            System.out.println("========================");
            show(list, book);
            break;
        case 2:
            for (int a = 0; list != null && a < list.size(); a++) {
                System.out.println(list.get(a).getId() + "."
                        + list.get(a).getName() + "," + list.get(a).getPrice());
            }
            show(list, book);
            break;
            
            
        case 3:
            System.out.println("请输入要修改图书的编号");
            String q = new Scanner(System.in).next();
            for (int a = 0; list != null && a < list.size(); a++) {
                if (list.get(a).getId().equals(q)) {
                    list.remove(a);
                    System.out.println("请输入要修改图书名称");
                    String n1 = new Scanner(System.in).next();
                    System.out.println("请输入要修改图书价格");
                    double p1 = new Scanner(System.in).nextDouble();
                    Book b = new Book(q, n1, p1);
                    list.add(b);
                    break;

                }
            }
            System.out.println("修改成功");
            System.out.println("========================");
            show(list, book);
            break;
        case 4:
            System.out.println("请输入要删除图书的名称");
            String name = new Scanner(System.in).next();
            for (int a = 0; list != null && a < list.size(); a++) {
                if (list.get(a).getName().equals(name)) {
                    list.remove(a);
                }
            }
            System.out.println("删除成功");
            System.out.println("========================");
            show(list, book);
            break;
            
        }
    }

}

　　

 

 

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 import="housework.Book"%>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>



</head>

<body>
    
     <%
        List<Book> list = new ArrayList<Book>();
        Book book = new Book();
        Book book1 = new Book("001", "jsp实用教程", 45.88);
        Book book2 = new Book("002", "C程序设计", 59.80);
        Book book3 = new Book("003", "软件测试技术", 52.60);
        list.add(book1);
        list.add(book2);
        list.add(book3);
        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

create table Book(id int(10),name char(10),price double(10));

insert into Book(id,name,price)values(001,"jsp教程",88);

delete from Book where name='java';

delete from Book where name like '我%';

delete from Book;

update Book set price=18.8 where price>20;

select * from Book;

select * from Book where price>10;