1.
package text;
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 string, String name, double price) {
super();
this.id = string;
this.name = name;
this.price = price;
}
public Book() {
super();
}
}
package text;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class BookTest {
static List<Book> listbooks = new ArrayList<Book>();
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
creatBookList();
menu();
}
public static void creatBookList() {
// TODO Auto-generated method stub
Book b1 = new Book("1.", " VB ", 39.9);
listbooks.add(b1);
Book b2 = new Book("2.", " VS ", 59.9);
listbooks.add(b2);
Book b3 = new Book("3.", " C++ ", 49.9);
listbooks.add(b3);
Book b4 = new Book("4.", " java", 69.9);
listbooks.add(b4);
}
public static void menu() {
for (;;) {
System.out.println("------------------------");
System.out.println("- 1添加图书 -");
System.out.println("- 2修改图书 -");
System.out.println("- 3删除图书 -");
System.out.println("- 4查询图书 -");
System.out.println("- 5退出程序 -");
System.out.println("------------------------");
int a = inputInt("请选择操作:");
switch (a) {
case 1:
addBook();
break;
case 2:
updateBook();
break;
case 3:
delBook();
break;
case 4:
findBook();
break;
case 5:
return;
default:
System.out.println("输入错误,请重新输入");
break;
}
}
}
private static void findBook() {
// TODO Auto-generated method stub
System.out.println("id 图书名称 图书价格");
for (Book book : listbooks) {
System.out.println(book.getId() + " " + book.getName() + " "
+ book.getPrice());
}
}
private static void delBook() {
// TODO Auto-generated method stub
String id = inputStr("请输入要删除图书的id");
for (int i = 0; i < listbooks.size(); i++) {
Book book = listbooks.get(i);
if (id.equals(book.getId())) {
listbooks.remove(i);
}
}
}
private static void updateBook() {
// TODO Auto-generated method stub
String id = inputStr("请输入要修改的图书id");
for (int i = 0; i < listbooks.size(); i++) {
Book book = listbooks.get(i);
if (id.equals(book.getId())) {
book.setName(inputStr("请输入修改后的图书名称:"));
book.setPrice(inputDouble("请输入修改后的图书价格"));
listbooks.remove(i);
listbooks.add(i, book);
}
}
}
private static void addBook() {
// TODO Auto-generated method stub
String id = inputStr("请输入要添加的图书id");
String name = inputStr("请输入要添加的图书名称");
double price = inputDouble("请输入要添加的图书价格");
Book book = new Book(id, name, price);
listbooks.add(book);
}
public static String inputStr(String msg) {
System.out.print(msg);
return new Scanner(System.in).nextLine();
}
public static int inputInt(String msg) {
System.out.print(msg);
return new Scanner(System.in).nextInt();
}
public static double inputDouble(String msg) {
System.out.print(msg);
return new Scanner(System.in).nextDouble();
}
}
2.
<body>
<%
List<Book> list=new ArrayList<Book>();
Book b1 = new Book(1, "book1", 11.11);
Book b2 = new Book(2, "book2", 22.22);
Book b3 = new Book(3, "book3", 33.33);
list.add(b1);
list.add(b2);
list.add(b3);
for(Book book4:list){
out.println(book4+"<br>");
}
%>
</body>
3.
create database Book;
use Book;
create table book(
id int(10) auto_increment primary key,
name varchar(50),
price double(6,2));
insert into Book(id,name,price)values(1,"天才在左疯子在右",5);
insert into Book(id,name,price)values(2,"人间失格",45);
insert into Book(id,name,price)values(3,"活着",15);
insert into Book(id,name,price)values(4,"三体",145);
insert into Book(id,name,price)values(5,"西游记",50);