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

package Cun;

public class Cun {
    private int id;
    private String name;
    private double price;
    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;
    }
    public Cun(int id,String name, double price) {
        super();
        this.id=id;
        this.name = name;
        this.price = price;
    }
    public Cun(){
        // TODO Auto-generated constructor stub
    }

    public void print() {
       

        }
}

package Cun;

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

public class zhu {
    static ArrayList<Cun> list = new ArrayList<Cun>();
    static Scanner ce = new Scanner(System.in);

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Cun book1 = new Cun(1, "青年1", 77);
        book1.print();
        Cun book2 = new Cun(2, "青年2", 88);
        book2.print();
        Cun book3 = new Cun(3, "青年3", 99);
        book3.print();
        list.add(book1);
        list.add(book2);
        list.add(book3);

        for (int i = 0; i < list.size(); i++) {
            Cun shu1 = list.get(i);
            System.out.println("id为" + shu1.getId() + "，名称为" + shu1.getName()
                    + "，价格为" + shu1.getPrice());
        }
        show();
    }

    private static void show() {
        // 展示
        System.out.println("请输入数字");
        System.out.println("1、添加");
        System.out.println("2、删除");
        System.out.println("3、修改");
        System.out.println("4、查询");

        int xuan = ce.nextInt();
        switch (xuan) {
        case 1:
            add();
            break;
        case 2:
            delete();
            break;
        case 3:
            update();
            break;
        case 4:
            select();
            break;
        }
    }

    private static void add() {
        // 添加
        System.out.println("输入要添加图书的id");
        int id = ce.nextInt();
        System.out.println("输入要添加图书的名称");
        String name = ce.next();
        System.out.println("输入要添加图书的价格");
        int price = ce.nextInt();
        Cun shu1 = new Cun(id, name, price);
        list.add(shu1);
        System.out.println("添加的图书id为" + shu1.getId() + "，名称为" + shu1.getName()
                + "，价格为" + shu1.getPrice());
        show();
    }

    private static void delete() {
        // 删除
        System.out.println("请输入要删除图书的id");
        int id = ce.nextInt();
        for (int i = 0; i < list.size(); i++) {
            if (id == list.get(i).getId()) {
                list.remove(i);
                System.out.println("删除成功");
            }
        }
        show();
    }

    private static void update() {
        // 修改
        System.out.println("输入要修改图书的id");
        int id = ce.nextInt();
        for (int i = 0; i < list.size() - 1; i++) {
            if (id == list.get(i).getId()) {
                list.remove(i);
                System.out.println("输入修改后的名称");
                String name = ce.next();
                System.out.println("输入修改后的价格");
                int price = ce.nextInt();
                Cun shu1 = new Cun(id, name, price);
                System.out.println("id为" + shu1.getId() + "，修改后的名称为"
                        + shu1.getName() + "，价格为" + shu1.getPrice());
                list.add(shu1);
            }
        }
        show();
    }

    private static void select() {
        // 查询
        System.out.println("请输入要查询图书的id");
        int id = ce.nextInt();
        for (int i = 0; i < list.size(); i++) {
            if (id == list.get(i).getId()) {
                Cun shu2 = list.get(i);
                System.out.println("id为" + shu2.getId() + "，名称为"
                        + shu2.getName() + "，价格为" + shu2.getPrice());
            }
        }
        show();
    }

}

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" import="Cun.Cun"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>index.jsp</title>
  </head>
  <body>


<%

        ArrayList<Cun> list=new ArrayList<Cun>();
        Cun book1=new Cun(1,"青年1",77);
        Cun book2=new Cun(2,"青年2",88);
        Cun book3=new Cun(3,"青年3",99);
        
        list.add(book1);
        list.add(book2);
        list.add(book3);
        for (int i = 0; i < list.size(); i++) {
            Cun shu=list.get(i);
            int id=shu.getId();
            String name=shu.getName();
            double price=shu.getPrice();
            out.print("id为"+id+",书名为"+name+",价格为"+price+"<br>");

        }
        
    %>


  </body>
</html>