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 book; import java.util.ArrayList; import java.util.List; public class Book1 { 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 Book1(String id, String name, double price) { super(); this.id = id; this.name = name; this.price = price; } public Book1() { super(); // TODO Auto-generated constructor stub } List<Book1> list=new ArrayList<Book1>(); public void add(Book1 b){ list.add(b); } public boolean remove(Book1 b){ return list.remove(b); } public void set(Book1 b,int index){ list.set(index, b); } 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 Book2 { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub Book1 b1=new Book1("1","月亮与六便士",10); Book1 b2=new Book1("2","三体",20); Book1 b3=new Book1("3","简爱",30); Book1 b4=new Book1("4","傲慢与偏见",40); Book1 b=new Book1(); 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></title> </head> <%@ page import="book.Book1" %> <body> <% List<Book1> list=new ArrayList<Book1>(); Book1 b1=new Book1(); b1.setId("a"); b1.setName("月亮与六便士"); b1.setPrice(39); Book1 b2=new Book1(); b2.setId("b"); b2.setName("向前一步"); b2.setPrice(28); Book1 b3=new Book1(); b3.setId("c"); b3.setName("野性的呼唤"); b3.setPrice(35); list.add(b1); list.add(b2); list.add(b3); for(int i=0;i<list.size();i++){ out.print("ID:"+list.get(i).getId()+",Bookname:"+list.get(i).getName()+",prices:"+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("月亮与六便士",10); INSERT into book(name,price) value("面对困难的勇气",20); insert into book(name,price) VALUE("高等数学",30); insert into book(name,price) VALUE("时间简史",40); insert into book(name,price) VALUE("我和我的祖国",50); select * from book; 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%'; select * from book;
