目录

一.book

1.在book包中的Book 类用来定义和引用书的名字，作者，价格，类型等。

2.在book包中的第二个类是BookList是用来构建书架，和书架上的初始书本，

二、ioperations

1.AddOperation (增加图书)

2.BorrowOperation (借阅图书)

3.DelOperation (删除图书)

4.ExitOperation (显示图书)

5.FindOperation (查找图书)

6.IOPeration(接口)

7.ReturnOperation（归还图书）

8.ShowOperation（显示图书）

 三、User

 1.AdminUser(管理员)

2.NormalUser（普通用户）

3.User

 四、Main类 

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 图书管理系统的作用：显而易见，图书管理系统的出现就是为了缓和图书管理员的管理任务。当然，这其中也蕴含了一定的抽象意义，就是实现了从计算机上的虚拟化在现实生活中的实际运用；实现了图书馆由传统走向信息化道路的愿望。可以说，这样的管理系统是极大地减轻了管理员的负担。这样的程序在将图书信息进行简明化处理后，就实现了图书信息的集中化管理，使得管理的成本也大幅度降低。在进行查找操作时，系统可以快速地进行综合查询，得到最准确的结果。 

 图书管理系统构建简单的流程图

选择身份进入后选择你要做的内容，通过这个架构来编写代码。

首先我们先创建三个包

 

一.book

 

1.在book包中的Book 类用来定义和引用书的名字，作者，价格，类型等。

public class Book {private String name;//定义书的各种特性：名字，作者，类型，还有是否借出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 == true) ? " 已借出" : " 未借出") +'}';}
}

2.在book包中的第二个类是BookList是用来构建书架，和书架上的初始书本，

public class BookList {private Book[] books = new Book[10];private int usedSize;public BookList() {this.books[0] = new Book("狂人日记","鲁迅",10,"小说");this.books[1] = new Book("淘气包马小跳","杨红樱",10,"小说");this.books[2] = new Book("笑猫日记","杨红樱",16,"小说");this.books[3] = new Book("阿Q正传","鲁迅",16,"小说");this.books[4] = new Book("红楼梦","曹雪芹",30,"小说");this.usedSize = 5;  //初始书本个数}public int getUsedSize() {return usedSize;}public void setUsedSize(int usedSize) {this.usedSize = usedSize;}public Book getBook(int pos) {return books[pos];}public void setBook(int pos,Book book) {this.books[pos] = book;}public Book[] getBooks() {return books;}
}

二、ioperations

1.AddOperation (增加图书)

package ioperations;
import book.Book;
import book.BookList;
public class AddOperation  implements IOPeration {public void work(BookList bookList) {System.out.println("新添加的图书");int currentSize = bookList.getUsedSize();if(currentSize == bookList.getBooks().length) {System.out.println("书架已经存满");return;}Scanner scanner = new Scanner(System.in);System.out.println("请输入书名：");String name = scanner.nextLine();System.out.println("请输入作者：");String author = scanner.nextLine();System.out.println("请输入书的类型：");String type = scanner.nextLine();System.out.println("请输入价格：");int price = scanner.nextInt();Book newBook = new Book(name,author,price,type);for (int i = 0; i < currentSize; i++) {Book book = bookList.getBook(i);if(book.getName().equals(name)) {System.out.println("这本书已经存在");return;}}bookList.setBook(currentSize,newBook);bookList.setUsedSize(currentSize+1);System.out.println("添加成功");}
}

2.BorrowOperation (借阅图书)

package ioperations;
import book.Book;
import book.BookList;import java.util.Scanner;public class BorrowOperation implements IOPeration {@Overridepublic void work(BookList bookList) {System.out.println("借阅图书");Scanner scanner = new Scanner(System.in);System.out.printf("请输入你借阅的书名：");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("已被借出");return;}book.setBorrowed(true);System.out.println("借阅成功");return;}}System.out.println("不存在");}
}

3.DelOperation (删除图书)

package ioperations;
import book.Book;
import book.BookList;import java.util.Scanner;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.print("请输入你删除的书名：");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(i == currentSize) {System.out.println("该书不存在");return ;}for (int j = pos; j < currentSize-1; j++) {Book book = bookList.getBook(j+1);bookList.setBook(j,book);}bookList.setBook(currentSize-1,null);bookList.setUsedSize(currentSize-1);System.out.println("已经删除");}
}

4.ExitOperation (显示图书)

package ioperations;
import book.BookList;public class ExitOperation implements IOPeration {@Overridepublic void work(BookList bookList) {System.out.println("退出系统");System.exit(0);}
}

5.FindOperation (查找图书)

package ioperations;
import book.Book;
import book.BookList;
import java.util.Scanner;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.printf("请输入你的书名：");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("已经找到");System.out.println(book);return;}}System.out.println("不存在");}
}

6.IOPeration(接口)

定义一个标准（接口）

package ioperations;
import book.BookList;public interface IOPeration {void work(BookList bookList);
}

7.ReturnOperation（归还图书）

package ioperations;
import book.Book;
import book.BookList;import java.util.Scanner;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.printf("请输入你归还的书名：");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()) {book.setBorrowed(false);System.out.println("归还成功");return;}}}System.out.println("不存在");}
}

8.ShowOperation（显示图书）

package ioperations;
import book.Book;
import book.BookList;public class ShowOperation implements IOPeration {@Overridepublic void work(BookList bookList) {System.out.println("显示图书");int currentSize = bookList.getUsedSize();//3for (int i = 0; i < currentSize; i++) {Book book = bookList.getBook(i);System.out.println(book);}}
}

 三、User

 1.AdminUser(管理员)

管理员可以管理书架，编辑图书的增加与删除。

管理员对图书的数量，图书号，图书类型，图书名称等进行修改、删除管理，如果普通用户在线借书，图书总数会相应减少。

package user;
import ioperations.*;
import java.util.Scanner;
import ioperations.IOPeration;public class AdminUser extends User{public AdminUser(String name) {super(name);this.operations = new IOPeration[]{new ExitOperation(),new FindOperation(),new AddOperation(),new DelOperation(),new ShowOperation()};}public int menu() {System.out.println("欢迎"+this.name+"来到图书系统");System.out.println("//");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("//");Scanner scanner = new Scanner(System.in);System.out.println("请输入你的操作：");int choice = scanner.nextInt();return choice;}}

2.NormalUser（普通用户）

普通用户可以借阅书籍，在使用后进行归还书籍。

package user;
import ioperations.*;import java.util.Scanner;public class NormalUser extends User{public NormalUser(String name) {super(name);this.operations = new IOPeration[]{new ExitOperation(),new FindOperation(),new BorrowOperation(),new ReturnOperation()};}public int menu() {System.out.println("/");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("/");Scanner scanner = new Scanner(System.in);System.out.println("请输入你的操作：");int choice = scanner.nextInt();return choice;}
}

3.User

package user;
import book.BookList;
import ioperations.IOPeration;public abstract class User {protected String name;public IOPeration[] operations;public User(String name) {this.name = name;}public abstract int menu();public void doOperation(int choice, BookList bookList) {operations[choice].work(bookList);}public void doIoperation(int choice, BookList bookList) {}
}

 四、Main类

用于将整个项目串联到一起，然后整合起来运行。

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();System.out.println("你好");User user = login();while (true){int choice =user.menu();user.doIoperation(choice,bookList);}}}

希望对大家关于图书管理系统构建有所帮助

谢谢观看！！！