案例--图书管理系统
1.创建实体类Book
package com.work.pojo;
/**
*@Author: 憨憨浩浩
*@CreateTime: 2023-12-16 17:27
*@Description: Book实体类
*/
public class Book {
private int id; // 编号
private String name; // 图书名称
private String author; // 图书作者
private double price; // 图书价格
private String desc; // 图书简介
public Book() {
}
public Book(int id, String name, String author, double price, String desc) {
this.id = id;
this.name = name;
this.author = author;
this.price = price;
this.desc = desc;
}
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 String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
@Override
public String toString() {
return "图书id：" + id +
", 图书名称：" + name +
", 图书作者：" + author +
", 图书价格：" + price +
", 图书简介：" + desc;
}
}
2.创建接口BookService
package com.work.service;
import com.work.pojo.Book;
/**
* @Author: 憨憨浩浩
* @CreateTime: 2023-12-16 17:30
* @Description: book实体类的业务逻辑
*/
public interface BookService {
// 添加图书
public boolean addBook(Book book);
// 根据id修改图书名称
public boolean updateBook(int id,String name);
// 根据id删除图书
public boolean deleteBook(int id);
// 查询所有书籍
public void selectBooks();
}
3.实现BookService接口
package com.work.service.impl;
import com.work.pojo.Book;
import com.work.service.BookService;
import java.util.ArrayList;
/**
*@Author: 憨憨浩浩
*@CreateTime: 2023-12-16 20:40
*@Description: BookService接口的实现类
*/
public class BookServiceImpl implements BookService {
// 创建一个集合接收书籍信息
private ArrayList books = new ArrayList();
/**
* @description: 添加图书
* @author: 憨憨浩浩
* @date: 2023/12/17 8:54
* @param: [book]
* @return: boolean
**/
@Override
public boolean addBook(Book book) {
books.add(book);
return true;
}
/**
* @description: 根据id修改图书名称
* @author: 憨憨浩浩
* @date: 2023/12/17 8:57
* @param: [id, name]
* @return: boolean
**/
@Override
public boolean updateBook(int id, String name) {
for (int i = 0; i < books.size(); i++) {
Book book = (Book)(books.get(i));
if (id == book.getId()){
book.setName(name);
return true;
}
}
return false;
}
/**
* @description: 根据id删除图书
* @author: 憨憨浩浩
* @date: 2023/12/17 9:00
* @param: [id]
* @return: boolean
**/
@Override
public boolean deleteBook(int id) {
for (int i = 0; i < books.size(); i++) {
Book book = (Book)(books.get(i));
if (id == book.getId()){
books.remove(book);
return true;
}
}
return false;
}
/**
* @description: 查询所有图书
* @author: 憨憨浩浩
* @date: 2023/12/17 9:00
* @param: []
* @return: void
**/
@Override
public void selectBooks() {
for (Object book : books) {
System.out.println(book);
}
}
}
4.书写测试类
package com.work.test;
import com.work.pojo.Book;
import com.work.service.impl.BookServiceImpl;
import java.util.Scanner;
/**
*@Author: 憨憨浩浩
*@CreateTime: 2023-12-17 08:59
*@Description: 图书测试类
*/
public class BooksTest {
public static void main(String[] args) {
// 定义扫描器
Scanner scan = new Scanner(System.in);
// 定义bookServiceImpl实现类
BookServiceImpl bookService = new BookServiceImpl();
// 打印系统头部
System.out.println("******************************");
System.out.println("*********图书管理系统**********");
System.out.println("******************************");
while (true){
System.out.println("1、添加图书 2、根据id修改图书名称 3、根据id删除图书信息 4、查询所有图书 0、退出");
System.out.println("请输入你操作的编号：");
// 定义变量接收输入的操作编号
int num = scan.nextInt();
switch (num){
case 1: // 添加图书
System.out.println("请输入书籍id：");
int id = scan.nextInt();
System.out.println("请输入书籍名称：");
String name = scan.next();
System.out.println("请输入书籍作者：");
String author = scan.next();
System.out.println("请输入书籍价格：");
double price = scan.nextDouble();
System.out.println("请输入书籍简介：");
String desc = scan.next();
Book book = new Book(id,name,author,price,desc);
// 添加图书
if (bookService.addBook(book)){
System.out.println("添加成功");
} else {
System.out.println("添加失败");
}
break;
case 2: // 根据id修改图书名称
System.out.println("请输入你要修改的书籍id：");
id = scan.nextInt();
System.out.println("请输入你要修改的书籍名称：");
name = scan.next();
// 根据id修改图书名称
if (bookService.updateBook(id,name)){
System.out.println("修改成功");
} else {
System.out.println("修改失败");
}
break;
case 3: // 根据id删除图书
System.out.println("请输入你要删除的书籍id：");
id = scan.nextInt();
// 根据id删除图书
if (bookService.deleteBook(id)){
System.out.println("删除成功");
} else {
System.out.println("删除失败");
}
break;
case 4: // 查询所有图书
// 查询所有图书
bookService.selectBooks();
break;
case 0:
System.out.println("你已退出图书管理系统");
return;
default:
System.out.println("暂无此操作，请重新输入");
break;
}
}
}
}
5.结果展示
