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 book; import java.util.ArrayList; import java.util.List; 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(); // TODO Auto-generated constructor stub } List<Book> list=new ArrayList<Book>(); //添加 public void add(Book b){ list.add(b); } //删除 public boolean remove(Book b){ return list.remove(b); } //修改 public void set(Book b,int index){ list.set(index, b); } //查询 public void showAll(){ for(int i=0;i<list.size();i++){ System.out.println("ID:"+list.get(i).getId()+",NAME:"+list.get(i).getName()+",PRICE:"+list.get(i).getPrice()); } } }
package book; public class bookTest { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Book b1=new Book("a","aa",10); Book b2=new Book("b","bb",20); Book b3=new Book("c","cc",30); Book b4=new Book("d","dd",40); Book b=new Book(); b.add(b1); b.add(b2); b.add(b3); b.showAll(); b.set(b4, 0); System.out.println("=============="); b.showAll(); System.out.println("=============="); b.remove(b4); b.showAll(); } }
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"%> <html> <head> <title>My JSP 'd1.jsp' starting page</title> </head> <%@ page import="book.Book" %> <body> <% List<Book> list=new ArrayList<Book>(); Book b1=new Book(); b1.setId("a"); b1.setName("中华小当家"); b1.setPrice(10); Book b2=new Book(); b2.setId("b"); b2.setName("三国演义"); b2.setPrice(20); list.add(b1); list.add(b2); for(int i=0;i<list.size();i++){ out.print("ID:"+list.get(i).getId()+",NAME:"+list.get(i).getName()+",PRICE:"+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 PRIMARY KEY auto_increment, name varchar(30) NOT NULL, price DOUBLE ); select * from book; INSERT INTO book (name,price) VALUE("三国演绎",10); INSERT into book(name,price) value("中华小当家",20); insert into book(name,price) VALUE("我们的家",30); update book set price=18.8 where price>20; select * from book where price>10; delete from book where name like '我%';