图书管理系统的作用：

高效的图书管理 图书管理系统通过自动化管理，实现了图书的采编、编目、流通管理等操作的自动化处理，大大提高了图书管理的效率和准确性。 工作人员可以通过系统快速查找图书信息，实时掌握图书的借还情况，避免了繁琐的手工操作和人为错误。

主要功能：

1. 图书管理：添加、删除、修改图书信息。
2. 用户管理：用户注册、登录功能。
3. 借阅与归还：用户可以借阅和归还书籍。
4. 查询功能：可以根据书名或作者查询书籍信息。

通过不同包的串通和引用，来实现一个简单的图书管理系统

 

代码实现： 

//定义一个book的包，包括Book和BookList两个类
public class Book {private String name;private String author;private int price;private String type;private boolean isBorrowed;public Book(String name, String author, int price, String type) {this.name = name;this.author = author;this.price = price;this.type = type;}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;}public String getType() {return type;}public void setType(String type) {this.type = type;}public boolean isBorrowed() {return isBorrowed;}public void setBorrowed(boolean borrowed) {isBorrowed = borrowed;}@Overridepublic String toString() {return "Book{" +"name='" + name + '\'' +", author='" + author + '\'' +", price=" + price +", type='" + type + '\'' +", isBorrowed=" + isBorrowed +'}';}
}
public class BookList {private Book[] books=new Book[100];private int usedSize;public BookList(){books[0]=new Book("三国演义","罗贯中",10,"小说");books[1]=new Book("西游记","吴承恩",18,"小说");books[2]=new Book("红楼梦","曹雪芹",14,"小说");this.usedSize=3;}public Book getBook(int pos) {return books[pos];}public void setBook(int pos, Book book) {this.books[pos] = book;}public int getUsedSize() {return usedSize;}public void setUsedSize(int usedSize) {this.usedSize = usedSize;}public Book[] getBooks() {return books;}public void setBooks(Book[] books) {this.books = books;}
}//再定义一个user包，包括管理员的类和普通用户的类public abstract class User {public String name;public IOperation[] iOperations;public User(String name){this.name=name;}public abstract int menu();public void doIOperation(int choice, BookList bookList){iOperations[choice].work(bookList);}
}public class AdminUser extends User{public AdminUser(String name){super(name);this.iOperations=new IOperation[]{new ExitOperation(),new FindOperation(),new AddOperation(),new DelOperation(),new ShowOperation()};}@Overridepublic int menu() {System.out.println("****管理员菜单****");System.out.println("****************");System.out.println("0.退出系统");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("****************");Scanner scanner=new Scanner(System.in);System.out.println("请输入你的操作");int choice=scanner.nextInt();return choice;}
}public class NormalUser extends User{public NormalUser(String name) {super(name);this.iOperations=new IOperation[]{new ExitOperation(),new FindOperation(),new BorrowOperation(),new ReturnOperation(),};}@Overridepublic int menu() {System.out.println("****普通用户菜单****");System.out.println("******************");System.out.println("0.退出系统");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("******************");Scanner scanner=new Scanner(System.in);System.out.println("请输入你的操作");int choice=scanner.nextInt();return choice;}}在定义一个operation包，包括一个接口和各种操作的类public interface IOperation {void work(BookList bookList);
}public class AddOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("添加图书");int currentSize= bookList.getUsedSize();if(currentSize==bookList.getBooks().length){System.out.println("放满了，放不下了");return;}Scanner scanner=new Scanner(System.in);System.out.println("请输入你要添加的书籍");String name=scanner.nextLine();System.out.println("请输入作者");String author=scanner.nextLine();System.out.println("请输入类型");String type= scanner.nextLine();System.out.println("请输入价格");int price=scanner.nextInt();Book book=new Book(name,author,price,type);for (int i = 0; i < currentSize; i++) {Book book1=bookList.getBook(i);if(book1.getName().equals(name)){System.out.println("有这本书不能插入");return;}}bookList.setBook(currentSize,book);bookList.setUsedSize(currentSize+1);}
}public class BorrowOperation implements IOperation{public void work(BookList bookList) {System.out.println("借阅图书");Scanner scanner=new Scanner(System.in);System.out.println("输入你需要借阅的书本");String name=scanner.nextLine();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("该书已被借出");return;}book.setBorrowed(true);System.out.println("借阅成功");return;}}System.out.println("没有你要借阅的书本");}
}public class DelOperation implements IOperation{public void work(BookList bookList) {System.out.println("删除图书");Scanner scanner=new Scanner(System.in);System.out.println("请输入你要删除的书籍");String name=scanner.nextLine();int currentSize= bookList.getUsedSize();int pos=-1;int i = 0;for (; i <currentSize; i++) {Book book=bookList.getBook(i);if (book.getName().equals(name)){pos=i;break;}}if (pos==currentSize){System.out.println("没有你要删除的书籍");return;}for (int j = 0; j < currentSize; j++) {Book book=bookList.getBook(j+1);bookList.setBook(j,book);}bookList.setUsedSize(currentSize-1);System.out.println("删除成功");}
}public class ExitOperation implements IOperation{public void work(BookList bookList) {System.out.println("退出系统");System.exit(0);}
}public class FindOperation implements IOperation{public 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");String name=scanner.nextLine();int currentSize=bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book=bookList.getBook(i);if (book.getName().equals(name)){System.out.println("找到了");System.out.println(book);return;}}System.out.println("没有找到这本书");}
}public class ReturnOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("归还图书");Scanner scanner=new Scanner(System.in);System.out.println("输入你需要归还的书本");String name=scanner.nextLine();int currentSize= bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book=bookList.getBook(i);if(book.getName().equals(name)){book.setBorrowed(false);System.out.println("归还成功");return;}}System.out.println("没有你要归还的书本");}
}public class ShowOperation implements IOperation{@Overridepublic void work(BookList bookList) {System.out.println("显示图书");int currentSize= bookList.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book=bookList.getBook(i);System.out.println(book);}}
}最后一个类来串通整个操作过程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();User user=login();while (true) {int choice = user.menu();user.doIOperation(choice, bookList);}}
}

希望能对大家有所帮助！！！！！