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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------------------------------------------------------
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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
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{ @Override public 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{ @Override public 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{ @Override public 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break if(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]; error Book 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{ @Override public 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{ @Override 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{ @Override public 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{ @Override public 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() }; } @Override public 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() }; } @Override public 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：
这次的图书管理系统之旅就到这里了；