jsp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
public class Book { private int id; private String name; private double price; public Book(int id, String name, double price) { super(); this.id = id; this.name = name; this.price = price; } public Book() { super(); } public int getId() { return id; } public void setId(int 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; } }
import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class main { public static void main(String[] args) { List<Book> list = new ArrayList<Book>(); Book book = new Book();
Book b1 = new Book(1, "斗破苍穹", 666);
Book b2 = new Book(2, "斗罗大陆", 999);
Book b3 = new Book(3, "你是我的荣耀", 123);
list.add(b1); list.add(b2); list.add(b3); show(list, book); } public static void show(List<Book> list, Book book) { System.out.println("1.添加图书"); System.out.println("2.删除图书"); System.out.println("3.修改图书"); System.out.println("4.查询图书"); System.out.println("请选择"); 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("请添加图书的编号:"); book.setId(new Scanner(System.in).nextInt()); System.out.println("请添加图书的名称:"); book.setName(new Scanner(System.in).next()); System.out.println("请添加图书的价格:"); book.setPrice(new Scanner(System.in).nextDouble()); list.add(book); System.out.println("添加成功"); show(list, book); break; case 2: System.out.println("请输入要删除图书的名称:"); String name=new Scanner(System.in).next(); for (int j = 0; list != null && j < list.size(); j++) { if (list.get(j).getName().equals(name)) { list.remove(j); } } System.out.println("删除成功"); show(list, book); break; case 3: System.out.println("请输入要修改图书的编号:"); int k=new Scanner(System.in).nextInt();; for (int j = 0; list != null && j < list.size(); j++) { if (list.get(j).getName().equals(k)) { list.remove(j); System.out.println("请输入修改后图书的名称:"); String name1=new Scanner(System.in).next(); System.out.println("请输入修改后图书的价格:"); double price1=new Scanner(System.in).nextDouble(); Book b=new Book(k,name1,price1); list.add(b); break; } } System.out.println("修改成功"); show(list, book); break; case 4: for (int j = 0; list != null && j < list.size(); j++) { System.out.println(list.get(j).getId() + "." + list.get(j).getName() + "," + list.get(j).getPrice()); } 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。
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
建表 create table books{ id int not null, name varchar() price decimal, primary key(id) }; 添加2个图书 insert into Book(id,name,price)values(1,"你是我的荣耀",100); insert into Book(id,name,price)values(2,"我在未来等你",15); 把20元以上的图书价格都修改为18.8, update book set price=18.8 where price>20; 查看全部图书 select *from book; 查看价格高于10块的全部图书 select * from book where price>10; 把所有名称是“我”开头的图书删除 delete from book where name like '我%'; 删除全部图书 delete from book;