Java第九周作业

1.

package packk;

public class Book {
	 int id;
     String name;
     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 Book(int id, String name, double price) {
         super();
         this.id = id;
         this.name = name;
         this.price = price;
     }


     public Book() {
         super();
         // TODO Auto-generated constructor stub
     }

     @Override
     public String toString() {
         return "Book [id=" + id + ", name=" + name + ", price=" + price + "]";
     }

}

　　

package packk;
import java.util.ArrayList;
import java.util.Scanner;

public class product {

    static java.util.List<Book> list =new ArrayList<Book>();
    static{
        Book book1 =new Book(1, "初中", 100);
        Book book2 =new Book(2, "高中", 300);
        Book book3 =new Book(3, "大学", 800);
        list.add(book1);
        list.add(book2);
        list.add(book3);
    }
    
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        while(true){
            System.out.println("1.添加");
            System.out.println("2.删除");
            System.out.println("3.修改");
            System.out.println("4.查询");
            System.out.println("0.退出程序");
        System.out.println("请选择0-4");
        Scanner scanner=new Scanner(System.in);
        int i=scanner.nextInt();
        switch (i) {
        case 1:
            addbook();
            System.out.println("是否返回主界面Y/N?");
            String s=scanner.next();
            if (s.equals("Y")) {
                break;
            }
            else {
                return;
            }
        case 2:
            delBoook();
            System.out.println("是否返回主界面Y/N?");
            s=scanner.next();
            if (s.equals("Y")) {
                break;
            }
            else {
                return;
            }
        case 3:
            update();
            System.out.println("是否返回主界面Y/N?");
            s=scanner.next();
            if (s.equals("Y")) {
                break;
            }
            else {
                return;
            }
        case 4:
            search();    
            System.out.println("是否返回主界面Y/N?");
            s=scanner.next();
            if (s.equals("Y")) {
                break;
            }
            else {
                return;
            }
        case 0:
            System.out.println("退出成功");
            return;
        }
        
    }
}
    private static void search() {
        // TODO Auto-generated method stub
        for (Book book4 : list) {
            System.out.println(book4);
        }
    }
    private static void update() {
        // TODO Auto-generated method stub
        System.out.println("请输入修改的图书id");
        int update=new Scanner(System.in).nextInt();
        
        for (Book book : list) {
            if (update==book.getId()) {
                System.err.println("请输入名称");
                String b1=new Scanner(System.in).next();
                System.err.println("请输入价格");
                int c1=new Scanner(System.in).nextInt();
                book.setName(b1);
                book.setPrice(c1);
                System.out.println("修改成功");
            }
        }
       
    }
    private static void delBoook() {
        System.out.println("请输入你要删除的图书id");
        int id=new Scanner(System.in).nextInt();
        try {
            for (Book book : list) {
                if (list.size()!=0) {
                    if (id==book.getId()) {
                        list.remove(book);
                        System.out.println("删除成功");
                    }
                }
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
        
    }
    private static void addbook() {
        // TODO Auto-generated method stub
        
        Scanner scanner=new Scanner(System.in);
        System.err.println("请输入id");
        int a=scanner.nextInt();
        System.err.println("请输入名称");
        String b=scanner.next();
        System.err.println("请输入价格");
        int c=scanner.nextInt();
        
        Book book=new Book(a, b, c);
        list.add(book);
        System.out.println("添加成功");
        
        
    }
}

　　

 

 2.

<%@page import="Book.Book"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head></head>
  
  <body>

<%

        ArrayList<Book> list=new ArrayList<Book>();
        Book book1=new Book(1,"初中",100);
        Book book2=new Book(2,"高中", 300);
        Book book3=new Book(3,"大学", 500);
        
        list.add(book1);
        list.add(book2);
        list.add(book3);
        for (int i = 0; i < list.size(); i++) {
            Book b=list.get(i);
            int id=b.getId();
            String name=b.getName();
            double price=b.getPrice();
            out.print("ID为"+id+"<br>"+"书名为："+name+"、价格为："+price+"<br>");

        }
        
    %>

  </body>
</html>

　　

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