1.书类

package book;

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;
    }

    @Override
    public String toString() {
        return "book{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                (isBorrowed == true ? " 已借出 ":" 未借出 ")+
                '}';
    }
}

2.图书列表

package book;

public class BookList {
    public Book[] bookList = new Book[10];
    private int usedSize;//当前书架上书的数目
    public BookList() {
        bookList[0] = new Book("三国演义","罗贯中",18,"小说");
        bookList[1] = new Book("水浒传","施耐庵",48,"小说");
        bookList[2] = new Book("西游记","吴承恩",28,"小说");
        this.usedSize = 3;
    }

    public int getUsedSize() {
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }
    //把书放到pos位置
    public void setBookList(int pos,Book book) {
        bookList[pos] = book;
    }
    //获取pos位置的书
    public Book getBook(int pos) {
        return bookList[pos];
    }
    //这里本质上是可以写借阅书籍等操作的
}

3.新增图书

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class AddOperation implements IOperation {
    public void work(BookList bookList) {
        System.out.println("新增图书！");
        Scanner scanner = new Scanner(System.in);
        System.out.println("输入你要新增书籍的名字：");
        String name = scanner.nextLine();
        System.out.println("输入你要新增书籍的作者：");
        String author = scanner.nextLine();
        System.out.println("输入你要新增书籍的类型：");
        String type = scanner.nextLine();
        System.out.println("输入你要查找新增书籍的价格：");
        int price = scanner.nextInt();
        Book book = new Book(name,author,price,type);
        int currentSize = bookList.getUsedSize();
        bookList.setBookList(currentSize,book);
        bookList.setUsedSize(currentSize + 1);//放入一本书
        System.out.println("新增成功");
    }
}

4.借阅图书

package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

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("输入你要借阅的书籍：");
        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(true);
                System.out.println("借阅成功，借阅书籍信息如下：");
                System.out.println(book);
                return;
            }
        }
        System.out.println("借阅失败，没有这本书籍！");
    }
}

5.删除图书

package operation;

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.println("输入你要删除书籍：");
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedSize();
        int index = -1;
        for (int i = 0; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if (book.getName().equals(name)) {
                index = i;
                break;
            }
        }
        //如果index==-1，说明没有这本书
        if (index == -1) {
            System.out.println("没有你要删除的图书");
            return;
        }
        //从这里开始删除
        for (int i = 0; i < currentSize-1; i++) {
            Book book = bookList.getBook(i + 1);
            bookList.setBookList(i,book);
        }
        bookList.setUsedSize(currentSize - 1);
    }
}

6.显示图书

package operation;

import book.Book;
import book.BookList;

public class DisplayOperation implements IOperation {
    public 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);
        }
    }
}

7.退出系统

package operation;

import book.BookList;

public class ExitOperation implements IOperation{
    public void work(BookList bookList){
        //可以对书架进行手动清空
        System.out.println("退出系统！");
        System.exit(0);
    }
}

8.查找图书

package operation;

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.println("输入你要查找的书籍：");
        String name = scanner.nextLine();
        int size = bookList.getUsedSize();
        for (int i = 0; i < size; i++) {
            Book book = bookList.getBook(i);
            if (book.getName().equals(name)) {
                System.out.println("找到了这本书");
                System.out.println(book);
                return;
            }
        }
        System.out.println("没有这本书");
    }
}

9.接口

package operation;

import book.BookList;

public interface IOperation {
    void work(BookList bookList);
}

10.归还图书

package operation;

import book.Book;
import book.BookList;

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("输入你要归还的书籍：");
        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，归还书籍信息如下：");
                System.out.println(book);
                return;
            }
        }
        System.out.println("归还失败，没有这本书籍！");
    }
}

11.管理员菜单

package user;

import operation.*;

import java.util.Scanner;

public class AdiminUser extends User {
    public AdiminUser(String name) {
        super(name);
        this.iOperations = new IOperation[] {
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new DisplayOperation()
        };
    }
    public int menu() {
        System.out.println("==============管理员菜单===========");
        System.out.println("hello "+this.name+" 欢迎来到图书小练习 ");
        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);
        int choice = scanner.nextInt();
        return choice;
    }
}

12.普通用户菜单

package user;

import operation.*;

import java.util.Scanner;

public class NormaUser extends User {
    public NormaUser(String name) {
        super(name);
        this.iOperations = new IOperation[] {
            new ExitOperation(),
            new FindOperation(),
            new BorrowOperation(),
            new ReturnOperation()
        };
    }
    
    public int menu() {
        System.out.println("==============普通用户菜单===========");
        System.out.println("hello "+this.name+" 欢迎来到图书小练习 ");
        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("请输入你的操作：");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

13.用户类

package user;

import book.BookList;
import operation.IOperation;

public abstract class User {
    protected String name;
    protected IOperation[] iOperations;

    public User(String name) {
        this.name = name;
    }

    public abstract int menu();

    public void doOperation(int choice, BookList bookList) {
        this.iOperations[choice].work(bookList);
    }
}

14.主函数

import book.BookList;
import user.AdiminUser;
import user.NormaUser;
import user.User;

import java.util.Scanner;

public class Main {
    public static User login() {
        System.out.println("请输入你的姓名：");
        Scanner scanner = new Scanner(System.in);
        String name  = scanner.nextLine();
        System.out.println("请输入你的身份：1：管理员 0：普通用户");
        int choice = scanner.nextInt();
        if (choice == 1) {
            return new AdiminUser(name);
        }else{
            return new NormaUser(name);
        }
    }

    public static void main(String[] args) {
        BookList bookList = new BookList();
        User user = login();
        //User user = AdiminUser(name);
        //User user = NormaUser(name);
        while (true){
            int choice = user.menu();
            user.doOperation(choice,bookList);
        }
    }
}