图书管理系统
1. 描述a> 角色b> 操作 2. 实现a> Book 类b> BookList 类c> IOperation 操作接口d> AddBook 类e> DeleteBook 类f> UpdateBook 类g> FindBook 类h> BorrowBook 类i> ReturnBook 类j> DisplayBook 类k> Exit 类l> User 类m> Admin 类n> NormalUser 类o> Main 类 3. 测试结果a> 管理员b> 普通用户1. 描述
a> 角色
图书管理系统有两个角色对书进行操作, 分别是普通用户类和管理员类.
b> 操作
操作可划分为: 增添图书, 删除图书, 更新图书, 查找图书, 借阅图书, 归还图书, 退出系统
2. 实现
a> Book 类
package java0126;/*** @author FMM* @version 7.0* @date /1/26 12:37*/public class Book {private String name;private String author;private int price;private String type;// 表示没有被借private boolean isBorrowed = false;public Book(String name, int price, String author, String type) {this.name = name;this.price = price;this.author = author;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) {this.isBorrowed = borrowed;}public void bookImformation() {System.out.println(this.name + " " + this.price + " "+ this.author + " " + this.type + " " + this.isBorrowed);}}
b> BookList 类
package java0126;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:37*/public class BookList {private Book[] books = new Book[100] ;private int size;// 图书管理系统的关闭和开启条件private boolean isOpen = true;public BookList() {this.books[this.size++] = new Book("三国演义",100, "罗贯中","历史小说");}public void addBook(String name, int price, String author, String type) {this.books[size++] = new Book(name, price, author, type);}public Book getBook(int index) {if (!checkIndex(index)) {return null;}return this.books[index];}public void setSize(int size) {this.size = size;}public boolean isOpen() {return isOpen;}public void setOpen(boolean open) {this.isOpen = open;}public int getSize() {return this.size;}public void borrowBook(int index) {if (!checkIndex(index)) {return;}if (!this.books[index].isBorrowed()) {this.books[index].setBorrowed(true);}}public void displayBook() {if (this.books == null) {System.out.println("没有书籍");return;}System.out.println(" 书名 " + " 价格 " + " 作者 " + " 类型 " + " 是否被借");for (int i = 0; i < this.size; i++) {this.books[i].bookImformation();}}public void deleteBook(int index) {if (!checkIndex(index)) {return;}for (int i = index; i < this.size - 1; i++) {this.books[i] = this.books[i + 1];}this.size--;}public void updateBook(int index) {if (!checkIndex(index)) {return;}Scanner scanner = new Scanner(System.in);System.out.println("请输入要修改的内容:");System.out.println("1. 书名");System.out.println("2. 作者");System.out.println("3. 类型");System.out.println("4. 价格");System.out.println("5. 书的状态");int choice = scanner.nextInt();switch (choice) {case 1:System.out.println("请输入修改后的书名: ");String name = scanner.next();this.books[index].setName(name);break;case 2:System.out.println("请输入修改后的作者: ");String author = scanner.next();this.books[index].setAuthor(author);break;case 3:System.out.println("请输入修改后的类型: ");String type = scanner.next();this.books[index].setType(type);break;case 4:System.out.println("请输入修改后的价格: ");int price = scanner.nextInt();this.books[index].setPrice(price);break;case 5:System.out.println("请输入修改后的书的状态(是否被借): ");boolean isBorrowed = scanner.hasNextBoolean();this.books[index].setBorrowed(isBorrowed);break;}}public boolean checkIndex(int index) {if (index < 0 && index >= this.size) {System.out.println("输入有误, 您输入的下标不存在!");return false;}return true;}}
c> IOperation 操作接口
package java0126.Operation;import java0126.BookList;/*** @author FMM* @version 7.0* @date /1/26 12:46*/public interface IOperation {public void work(BookList bookList);}
d> AddBook 类
package java0126.Operation;import java0126.BookList;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:42*/public class AddBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("添加书籍");Scanner scanner = new Scanner(System.in);System.out.println("请输入书的名字:");String name = scanner.next();System.out.println("请输入书的价格:");int price = scanner.nextInt();System.out.println("请输入书的类型:");String type = scanner.next();System.out.println("请输入书的作者:");String author = scanner.next();bookList.addBook(name, price, author, type);}}
e> DeleteBook 类
package java0126.Operation;import java0126.BookList;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:43*/public class DeleteBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("删除书籍");Scanner scanner = new Scanner(System.in);System.out.println("请输入要删除的书的下标");int index = scanner.nextInt();bookList.deleteBook(index);}}
f> UpdateBook 类
package java0126.Operation;import java0126.BookList;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:43*/public class UpdateBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("更新书籍信息");Scanner scanner = new Scanner(System.in);System.out.println("请输入要更新的书的下标:");int index = scanner.nextInt();bookList.updateBook(index);}}
g> FindBook 类
package java0126.Operation;import java0126.Book;import java0126.BookList;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:43*/public class FindBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("查找书籍");Scanner scanner = new Scanner(System.in);System.out.println("请输入要找的输的下标");int index = scanner.nextInt();Book book = bookList.getBook(index);book.bookImformation();}}
h> BorrowBook 类
package java0126.Operation;import java0126.BookList;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 15:48*/public class BorrowBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("借书");Scanner scanner = new Scanner(System.in);System.out.println("请输入要借的书的下标: ");int index = scanner.nextInt();// 该书存在 并且 书的状态是 false 未被借if (bookList.checkIndex(index) && !bookList.getBook(index).isBorrowed()) {// 借书, 将书的状态改为 true 表示已被借阅bookList.getBook(index).setBorrowed(true);}}}
i> ReturnBook 类
package java0126.Operation;import java0126.BookList;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 21:45*/public class ReturnBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("还书");Scanner scanner = new Scanner(System.in);System.out.println("请输入要借的书的下标: ");int index = scanner.nextInt();if (bookList.checkIndex(index) && bookList.getBook(index).isBorrowed()) {bookList.getBook(index).setBorrowed(false);}}}
j> DisplayBook 类
package java0126.Operation;import java0126.BookList;/*** @author FMM* @version 7.0* @date /1/26 14:12*/public class DisplayBook implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("显示书籍");bookList.displayBook();}}
k> Exit 类
package java0126.Operation;import java0126.BookList;/*** @author FMM* @version 7.0* @date /1/26 14:19*/public class Exit implements IOperation {@Overridepublic void work(BookList bookList) {System.out.println("退出");bookList.setOpen(false);}}
l> User 类
package java0126;import java0126.Operation.IOperation;/*** @author FMM* @version 7.0* @date /1/26 12:51*/public abstract class User {protected String name;protected IOperation[] userOperation;public abstract int menu();public void doOperation(int choice, BookList bookList) {this.userOperation[choice - 1].work(bookList);}}
m> Admin 类
package java0126;import java0126.Operation.*;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:51*/public class Admin extends User {public Admin(String name) {this.name = name;userOperation = new IOperation[]{new FindBook(),new AddBook(),new DeleteBook(),new UpdateBook(),new DisplayBook(),new Exit()};}@Overridepublic int menu() {System.out.println("=====================");System.out.println("1.查找书籍");System.out.println("2.添加书籍");System.out.println("3.删除书籍");System.out.println("4.更新书籍信息");System.out.println("5.显示书籍信息");System.out.println("6.退出");System.out.println("=====================");Scanner scanner = new Scanner(System.in);System.out.print("请输入你的选择的操作: ");int choice = scanner.nextInt();return choice;}}
n> NormalUser 类
package java0126;import java0126.Operation.*;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:51*/public class NormalUser extends User{public NormalUser(String name) {this.name = name;userOperation = new IOperation[]{new FindBook(),new BorrowBook(),new ReturnBook(),new DisplayBook(),new Exit()};}@Overridepublic int menu() {System.out.println("=====================");System.out.println("1.查找书籍");System.out.println("2.借阅书籍");System.out.println("3.归还书籍");System.out.println("4.显示书籍信息");System.out.println("5.退出");System.out.println("=====================");Scanner scanner = new Scanner(System.in);System.out.print("请输入你的选择的操作: ");int choice = scanner.nextInt();return choice;}}
o> Main 类
package java0126;import java.util.Scanner;/*** @author FMM* @version 7.0* @date /1/26 12:49*/public class Main {public static void main(String[] args) {// 1. 初始化书籍BookList bookList = new BookList();// 2. 登录User user = login();// 3. 执行相关操作while (bookList.isOpen() == true) {int choice = user.menu();user.doOperation(choice, bookList);}}public static User login() {System.out.println("0.管理员");System.out.println("1.用户");System.out.print("请输入您的选择:");Scanner scanner = new Scanner(System.in);int choice = scanner.nextInt();System.out.print("请输入用户名:");String name = scanner.next();if (choice == 1) {return new NormalUser(name);}return new Admin(name);}}
3. 测试结果
a> 管理员
管理角色测试结果
b> 普通用户
用户角色测试结果
