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欢迎来到我的Java图书管理系统，接下来让我们一同探索如何书写图书管理系统吧！

1管理端和用户端

2建立相关的三个包（book、operation、user）

3建立程序入口Main类

4程序运行

1.首先图书馆管理系统分为管理员端和用户端

1.1管理员端：AdminUser::menu()
------------------------------------------------------管理员菜单------------------------------------------------------

1.查找图书
2.新增图书
3.删除图书
4.显示图书
0.退出图书
------------------------------------------------------------------------------------------------------------------------

1.2用户端：NormalUser::menu()

------------------------------------------------------用户端----------------------------------------------------------

1.查找图书
2.借阅图书
3.归还图书
0.退出系统
------------------------------------------------------------------------------------------------------------------------

2.建立三个包（book（书相关的包），operation（操作相关的包），user（使用者相关的包））

2.1再在book包里面建立Book（书籍对象）和BookList（书架）类
Book

package book;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:12:39*/
public class Book{private String name;//书籍名称private String author;//作者private int price;//价格private String taye;//类型private boolean isBorrowed;;//是否被借出public Book(String name, String author, int price, String taye) {this.name = name;this.author = author;this.price = price;this.taye = taye;}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 int getPrice() {return price;}public void setPrice(int price) {this.price = price;}

这里可以通过快捷键alt+insert快速构造成员方法，也可以快速构建get和set
在这里插入图片描述

BookList

package book;
import java.security.PrivilegedAction;
/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:12:38*/public class BookList {private Book[] books; //存放书籍private static final int DEFAULT_SIZE = 10;private int usedSize; // 有效书籍的个数//private int xxxx;public BookList() {this.books = new Book[DEFAULT_SIZE];//预先存3本书this.books[0] = new Book("三国演义","罗贯中",19,"武侠");this.books[1] = new Book("西游记","吴承恩",20,"神话");this.books[2] = new Book("红楼梦","曹雪芹",15,"小说");this.usedSize = 3;}public Book[] getBooks() {return books;}public int getUsedSize() {return usedSize;}public void setUsedSize(int usedSize) {this.usedSize = usedSize;}//.....还有待补充的public Book getBook(int pos) {return books[pos];}public void setBooks(int pos,Book book) {books[pos] = book;}
}

2.2在operation包里面建立AddBook、 BorrowedBook、DelBook、ExitBook、FindBook ReturnBook、ShowBook类，IOPeration（接口）；
AddBook

package operation;
import book.Book;
import book.BookList;import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:17*/
public class AddBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("新增图书....");/*if(isFull(bookList)) {System.out.println("书架满了....");return;}*//* if(isFull(bookList)) {//扩容的代码 Arrays.copyOf();}*///1. 整理书籍的信息Scanner scanner = new Scanner(System.in);System.out.println("请输入书籍的名称：");String name = scanner.nextLine();System.out.println("请输入书籍的作者：");String author = scanner.nextLine();System.out.println("请输入书籍的价格：");int price = scanner.nextInt();scanner.nextLine();System.out.println("请输入书籍的类型：");String type = scanner.nextLine();Book book = new Book(name,author,price,type);//2.如果书架有这本书 则不能上架int currentSize = bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book tmp = bookList.getBook(i);if(tmp.getName().equals(name)) {System.out.println("有这本书，可以不上架！！");return;}}//3.没有这本书 则放到书籍数组当中bookList.setBooks(currentSize,book);bookList.setUsedSize(currentSize+1);}private boolean isFull(BookList bookList) {return bookList.getBooks().length ==bookList.getUsedSize();}
}

BorrowedBook

package operation;
import book.Book;
import book.BookList;import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:22*/
public class BorrowedBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("借阅图书....");System.out.println("请输入你要借阅的图书：");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();//1.先遍历数组 查找是否存在要借阅的图书int currentSize = bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book = bookList.getBook(i);if(book.getName().equals(name)) {//2.如果存在 检查 是否已经被借出if(book.isBorrowed()) {System.out.println("这本书已经被借出了！");}else {//3. 如果没有借出 可以借book.setBorrowed(true);System.out.println(book);System.out.println("借阅成功！！");}return;}}//4.如果不存在 则不能借阅System.out.println("没有你要找的这本书，无法借阅！！");}
}

DelBook

package operation;
import book.Book;
import book.BookList;import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:24*/
public class DelBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("删除图书....");Scanner scanner = new Scanner(System.in);//1、输入你要删除的图书名称：System.out.println("请输入要删除书籍的名称：");String name = scanner.nextLine();//2.查看当前书籍是否存在int index = -1;int i = 0;int currentSize = bookList.getUsedSize();for (; i < currentSize; i++) {Book tmp = bookList.getBook(i);if(tmp.getName().equals(name)) {index = i;break;}}//没有遇到breakif(i >= currentSize) {System.out.println("没有你要删除的书....");return;}//遇到break  此时开始真正删除for (int j = index; j < currentSize-1; j++) {//bookList[j] = bookList[j+1]; errorBook tmp = bookList.getBook(j+1);bookList.setBooks(j,tmp);}//修改usedSize的值bookList.setUsedSize(currentSize-1);bookList.setBooks(currentSize-1,null);System.out.println("删除图书成功了.....");}
}

ExitBook

package operation;import book.BookList;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:12*/
public class ExitBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("退出系统.....");int currentSize = bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {//bookList[i] = null;bookList.setBooks(i,null);}bookList.setUsedSize(0);System.exit(0);}
}

FindBook

package operation;import book.BookList;
import book.Book;
import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:25*/
public class FindBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("查找图书...");Scanner scanner = new Scanner(System.in);System.out.println("请输入你要查找的图书的名字：");String name = scanner.nextLine();//1.先确定  当前数组当中 有效的书籍个数int currentSize = bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book = bookList.getBook(i);if(book.getName().equals(name)) {System.out.println("找到这本书籍了，书籍内容如下：");System.out.println(book);return;}}System.out.println("没有你要查找的图书的书籍！！");}
}

ReturnBook

package operation;
import book.Book;
import book.BookList;import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:27*/
public class ReturnBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("归还图书....");System.out.println("请输入你要归还的图书：");Scanner scanner = new Scanner(System.in);String name = scanner.nextLine();//1.先遍历数组 查找是否存在要归还的图书int currentSize = bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book = bookList.getBook(i);if(book.getName().equals(name)) {if(!book.isBorrowed()) {System.out.println("这本书没有被借出过，不用还！");}else {System.out.println("归还成功");book.setBorrowed(false);System.out.println(book);}return;}}//4.如果不存在 则不能归还System.out.println("没有你要找的这本书，无法归还！！");}
}

ShowBook

package operation;
import book.Book;
import book.BookList;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:27*/
public class ShowBook implements IOPeration{@Overridepublic void work(BookList bookList) {System.out.println("打印图书....");int currentSize = bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book tmp = bookList.getBook(i);System.out.println(tmp);}}
}

IOPeration

package operation;import book.BookList;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:13:09*/
public interface IOPeration {void work(BookList books);
}

2.3 user包中建立AdminUser、NormalUser、User类；
AdminUser

package user;import operation.*;import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:12:43*/
public class AdminUser extends User{public AdminUser(String name) {super(name);this.ioPerations = new IOPeration[]{new ExitBook(),new FindBook(),new AddBook(),new DelBook(),new ShowBook()};}@Overridepublic int menu() {System.out.println("欢迎 "+this.name+" 来到图书管理系统!");System.out.println("**********管理员菜单*********");System.out.println("1. 查找图书");System.out.println("2. 新增图书");System.out.println("3. 删除图书");System.out.println("4. 显示图书");System.out.println("0. 退出系统");System.out.println("*****************************");System.out.println("请输入你的操作：");Scanner scanner = new Scanner(System.in);int choice = scanner.nextInt();return choice;}
}

NormalUser

package user;import operation.*;import java.util.Scanner;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:12:42*/
public class NormalUser extends User{public NormalUser(String name) {super(name);this.ioPerations = new IOPeration[]{new ExitBook(),new FindBook(),new BorrowedBook(),new ReturnBook()};}@Overridepublic int menu() {System.out.println("欢迎 "+this.name+" 来到图书管理系统!");System.out.println("**********普通用户菜单*********");System.out.println("1. 查找图书");System.out.println("2. 借阅图书");System.out.println("3. 归还图书");System.out.println("0. 退出系统");System.out.println("*****************************");System.out.println("请输入你的操作：");Scanner scanner = new Scanner(System.in);int choice = scanner.nextInt();return choice;}}

User

package user;import book.BookList;
import operation.IOPeration;/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:12:42*/
public abstract class User {public String name;public IOPeration[] ioPerations; //没有初始化public User(String name) {this.name = name;}public abstract int menu();public void doOperations(int choice, BookList books) {//return this.ioPerations[choice];IOPeration ioPeration = this.ioPerations[choice];//IOPeration ioPeration =  new FindBook();ioPeration.work(books);}
}

3整个程序的入口Main类
Main

/*** Created with IntelliJ IDEA.* Description:* User：Lenovo* Date:2024-10-26* Time:12:44*/
import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;import java.util.Scanner;
public class Main {public static User login(){Scanner scanner=new Scanner(System.in);System.out.println("请输入你的姓名： ");String name=scanner.nextLine();System.out.println("请输入你的身份：1：管理员   2：普通用户 ");int choice=scanner.nextInt();if(choice==1){return new AdminUser(name);}else{return new NormalUser(name);}}public static void main(String[] args) {BookList bookList=new BookList();/* Book[] books=new Book[10];books[0]=new Book{"三国演义","罗贯中",19,"武侠"};books[1]=new Book{"西游记","吴承恩",20,"神话"};books[2]=new Book{"红楼梦","曹雪芹",15,"小说"};usedsize=3;*/User user=login();while(true){int choice=user.menu();user.doOperations(choice,bookList);}}
}

这样一个简单的图书管理系统就实现了

4程序运行：
4.1以管理员身份运行：

4.2以用户身份运行：
在这里插入图片描述
这次的图书管理系统之旅就到这里了；