1. 图书管理系统菜单

如上图给用户选项

1. 管理员

2. 普通用户

2. 实现基本框架

 右键点src，选择new，选择Package命名三个包  book  operation  user

1.先选择book包，new两个类 book  bookList 

在book类中定义书的基本属性，并重写toString方法，构造方法 ，以及实现成员变量的Getter and Setter方法

在bookList类中定义一个一个数组储存图书Book[]，以及一个usedSize记录图书的数量，重写构造方法，并实现成员变量的Getter and Setter方法

 

 

 2. 选择operation包，创建一个接口并创建work方法（抽象方法），规范包中的类

package operation;import book.BookList;public interface IOperation {void work();
}

 

命名以上的类，并重写work方法

3. 选择user包，创建User类，AdminUser类，NormalUser类，让前者作为父类

在User类中定义name接受用户名，并创建抽象方法menu模拟进入程序

public abstract class User {protected String name;public User(String name) {this.name = name;}public abstract int menu();
}

程序的入口 

package book;
import user.*;
import java.util.Scanner;public class Main {public static User login(){Scanner scanner = new Scanner(System.in);System.out.println("请输入你的名字: ");String name = scanner.nextLine();System.out.println("请输入你的身份: ");System.out.println("1. 管理员        0. 普通用户");int choice = scanner.nextInt();if(choice == 1){AdminUser adminUser = new AdminUser(name);return adminUser;}else{NormalUser normalUser = new NormalUser(name);return normalUser;}}public static void main(String[] args) {BookList bookList = new BookList();User user = login();while (true){int choice = user.menu();user.doOperation(choice,bookList);}}
}

3. 实现业务 

3.1 借阅图书

package operation;import book.*;import java.util.Scanner;public class BorrowedOperation implements IOperation{public void work(BookList booklist) {System.out.println("借阅图书");Scanner scanner = new Scanner(System.in);System.out.println("请输入书名；");String name = scanner.nextLine();int currentSize = booklist.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book1 = booklist.getBook(i);if(book1.getName().equals(name)) {if(!book1.isBorrowed()){book1.setBorrowed(true);System.out.println("借阅成功");}else{System.out.println("这本图书已经被借走了：");}return;}}System.out.println("书架上内有你要借阅的图书：");}
}

3.2 查找图书

package operation;import book.*;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.println("请输入你要查找的图书: ");String name = scanner.nextLine();int currentSize = booklist.getUsedSize();for (int i = 0; i < booklist.getUsedSize(); i++) {Book book = booklist.getBook(i);if(book.getName().equals(name)){System.out.println("找到了你要找的书: ");System.out.println(book);return;}}System.out.println("书架上没有这本书！");}
}

3.3 归还图书

package operation;import book.*;import java.util.Scanner;public class ReturnOperation implements IOperation{public void work(BookList booklist) {System.out.println("归还图书");Scanner scanner = new Scanner(System.in);System.out.println("请输入书名；");String name = scanner.nextLine();int currentSize = booklist.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book1 = booklist.getBook(i);if(book1.getName().equals(name)){if(!book1.isBorrowed()){System.out.println("这本图书没有被借走");}else{book1.setBorrowed(false);System.out.println("归还成功");}return;}}System.out.println("没有你要归还的图书");}
}

3.4 新增图书

package operation;import book.*;import java.util.Scanner;public class AddOperation implements IOperation{@Overridepublic void work(BookList booklist) {System.out.println("增加图书");Scanner scanner = new Scanner(System.in);System.out.println("请输入书名；");String name = scanner.nextLine();System.out.println("请输入作者名；");String author = scanner.nextLine();System.out.println("请输入价格；");int price = scanner.nextInt();scanner.nextLine();System.out.println("请输入类型；");String style = scanner.nextLine();Book book = new Book(name,author,price,style);int currentSize = booklist.getUsedSize();for (int i = 0; i < currentSize; i++) {Book book1 = booklist.getBook(i);if(book1.getName().equals(name)){System.out.println("书架上已经有这本书了");return;}}booklist.setBook(currentSize,book);booklist.setUsedSize(currentSize+1);}
}

3.5 删除图书

package operation;import book.*;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.println("请输入你要删除的图书；");String name = scanner.nextLine();int currentSize = booklist.getUsedSize();if(currentSize == 0){System.out.println("书架为空：");return;}int index = -1;for (int i = 0; i < currentSize; i++) {Book book1 = booklist.getBook(i);if(book1.getName().equals(name)) {index = i;break;}}if(index == -1){System.out.println("书架上没有这本书：");return;}for (int i = index; i < currentSize; i++) {Book book1 = booklist.getBook(i+1);booklist.setBook(i,book1);}booklist.setUsedSize(currentSize-1);}
}

3.6 显示图书

package operation;import book.*;public class ShowOperation implements IOperation{public void work(BookList booklist) {System.out.println("展示图书");int currentSize = booklist.getUsedSize();for (int i = 0; i < booklist.getUsedSize(); i++) {Book book = booklist.getBook(i);System.out.println(book);}}
}

3.7 退出系统

package operation;import book.Book;
import book.BookList;public class ExitOperation implements IOperation{public void work(BookList booklist) {System.out.println("退出系统");for (int i = 0; i < booklist.getUsedSize(); i++) {booklist.setBook(i,null);}booklist.setUsedSize(0);System.exit(0);}
}