第七次作业4.27
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 abc;
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, "默读", 120);
book b2 = new book(2, "一级律师", 90);
book b3 = new book(3, "Romeo and Juliet", 134);
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).getId().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;
}
}
}
package abc;
public class book {
private Integer id;
private String name;
private double price;
public Integer getId() {
return id;
}
public void setId(Integer 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(Integer id, String name, double price) {
super();
this.id = id;
this.name = name;
this.price = price;
}
public book() {
super();
}
}
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="abc.book"%>
<!DOCTYPE HTML >
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<%
List<book> list = new ArrayList<book>();
book b1 = new book(1, "默读", 120);
book b2 = new book(2, "一级律师", 90);
book b3 = new book(3, "Romeo and Juliet", 134);
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,
create table book( id int(10) auto_increment primary key, name varchar(30), price double(5,2));
添加 insert into Book(id,name,price)values(1,"java",88);
根据名称删除图书， delete from book where name='Romeo and Juliet'; 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; 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块钱的全部图书 select * from book where price>10;
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