src/Main.java

import book.BookList;
import user.AdminUser;
import user.NormalUser;
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、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){
        //初始化书架
        BookList bookList = new BookList();
        User user = Login();//动态绑定
        while(true) {
            int choice = user.menu();
            user.doOperation(choice, bookList);
        }

    }
}

src/book/Book.java

import book.BookList;
import user.AdminUser;
import user.NormalUser;
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、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){
        //初始化书架
        BookList bookList = new BookList();
        User user = Login();//动态绑定
        while(true) {
            int choice = user.menu();
            user.doOperation(choice, bookList);
        }

    }
}

src/book/BookList.java

package book;

public class BookList {
    private Book[] books = new Book[10];

    private int usedSize;//记录当前有多少本书

    public BookList(){
        books[0] = new Book("三国演义","罗贯中",19,"小说" );
        books[1] = new Book("西游记","吴承恩",15,"小说" );
        books[2] = new Book("红楼梦","曹雪芹",25,"小说" );
        usedSize = 3;
    }

    /**
     * 得到书
     * @param pos 此时pos位置一定要合法
     * @return 这是一本书
     */
    public Book getBook(int pos){
        return books[pos];
    }

    /**
     * 放入图书
     * @param pos pos位置一定要合法
     * @param book 要放入的书
     */
    public void setBook(int pos,Book book){
        books[pos] = book;
    }

    /**
     * 实时获取当前书的个数
     * @return
     */
    public int getUsedSize(){
        return usedSize;
    }

    /**
     * 实时修改当前书架书的个数
     * @param size
     */
    public void setUsedSize(int size){
        usedSize = size;
    }

}

src/operation/AddOperation.java

package operation;
import book.BookList;
import java.util.Scanner;
import book.Book;
public class AddOperation implements IOperation{
    @Override
    public void word(BookList bookList){
        System.out.println("新增图书!");
        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:");
        String author = scanner.nextLine();
        System.out.println("请输入类型:");
        String type = scanner.nextLine();
        System.out.println("请输入价格:");
        int price = scanner.nextInt();
        Book book = new Book(name, author, price, type);
        bookList.setBook(bookList.getUsedSize(),book);
        bookList.setUsedSize(bookList.getUsedSize()+1);
        System.out.println("新增图书成功!");
    }
}

src/operation/BorrowOperation.java

package operation;
import book.BookList;
import java.util.Scanner;

public class BorrowOperation extends FindBook implements IOperation{
    @Override
    public void word(BookList bookList){
        System.out.println("借阅图书!");
        System.out.println("请输入你要借阅的图书名:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int ret = findBook(bookList, name);
        if(ret != -1){
            bookList.getBook(ret).setBorrowed(true);
            System.out.println("借阅成功!");
        }
        else{
            System.out.println("找不到此书!");
        }
    }
}

src/operation/DelOperation.java

package operation;
import book.BookList;
import java.util.Scanner;
public class DelOperation extends FindBook implements IOperation{
    @Override
    public void word(BookList bookList){
        System.out.println("删除图书!");
        System.out.println("请输入你要删除的图书:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int ret = findBook(bookList, name);
        if(ret != -1){
            for(; ret < bookList.getUsedSize() - 1; ret++){
                bookList.setBook(ret,bookList.getBook(ret + 1));
            }
            bookList.setBook(ret,null);
            bookList.setUsedSize(bookList.getUsedSize() - 1);

            System.out.println("删除成功!");
        }
        else{
            System.out.println("未找到图书!");
        }
    }

}

src/operation/DisplayOperation.java

package operation;

import book.BookList;

public class DisplayOperation implements IOperation{
    @Override
    public void word(BookList bookList) {
        System.out.println("显示图书!");
        for(int i = 0; i < bookList.getUsedSize(); i++){
            System.out.println(bookList.getBook(i));
        }
    }
}

src/operation/ExitOperation.java

package operation;

import book.BookList;

public class ExitOperation implements IOperation{

    @Override
    public void word(BookList bookList) {
        System.out.println("退出系统!");
        System.exit(0);
    }
}

src/operation/FindBook.java

package operation;

import book.BookList;

public class FindBook {
    public int findBook(BookList bookList, String name){
        int i = 0;
        for(i = 0; i < bookList.getUsedSize(); i++){
            if(name.equals(bookList.getBook(i).getName())){
                return i;
            }
        }
        return -1;
    }
}

src/operation/FindOperation.java

package operation;
import java.util.Scanner;
import book.BookList;
import book.Book;


public class FindOperation extends FindBook implements IOperation{
    @Override
    public void word(BookList bookList){
        System.out.println("查找图书!");
        System.out.println("请输入你要查找的图书:");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int ret = findBook(bookList, name);
        if(ret != -1){
            System.out.println(bookList.getBook(ret));
        }
        else{
            System.out.println("未找到此书!");
        }

    }
}
/*name.equals(bookList.getBook(i))*/
/*
int size = bookList.getUsedSize();
        for(int i = 0; i < size; i++){
        if(name.equals(bookList.getBook(i).getName())){
        System.out.println("找到了这本书!");
        System.out.println(bookList.getBook(i));
        return;
        }
        }
        System.out.println("没找到这本书!");*/

src/operation/IOperation.java

package operation;

import book.BookList;

/**
 * 操作接口
 */
public interface IOperation {
    void word(BookList bookList);
}

src/operation/ReturnOperation.java

package operation;
import book.BookList;
import java.util.Scanner;
public class ReturnOperation extends FindBook implements IOperation{
    @Override
    public void word(BookList bookList){
        System.out.println("归还图书!");
        System.out.println("请输入你归还的图书!");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        int ret = findBook(bookList, name);
        if(ret != -1){
            bookList.getBook(ret).setBorrowed(false);
            System.out.println("归还成功!");
        }
        else{
            System.out.println("没有找到此书!");
        }
    }
}

src/user/AdminUser.java

package user;
import operation.*;

import java.util.Scanner;
public class AdminUser extends User{
    public AdminUser(String name){
        super(name);
        this.iOperation = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new DisplayOperation()
        };
    }
    public int menu(){
        System.out.println("hello " +  + " 欢迎来到图书管理系统!");
        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("请输入你的操作:");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

src/user/NormalUser.java

package user;


import operation.*;

import java.util.Scanner;
public class NormalUser extends User{
    public NormalUser(String name){
        super(name);
        this.iOperation = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation(),
                new DisplayOperation()
        };
    }

    public int menu(){
        System.out.println("hello" +  + "欢迎来到图书管理系统");
        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("4.显示图书");
        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;
    }
}

src/user/User.java

package user;

import book.BookList;
import operation.IOperation;

public abstract class User {
    protected String name;//用户名
    protected IOperation[] iOperation;
    public User(String name){
         = name;
    }
    public abstract int menu();

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

src/Main.java

import book.BookList;
import user.AdminUser;
import user.NormalUser;
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、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){
        //初始化书架
        BookList bookList = new BookList();
        User user = Login();//动态绑定
        while(true) {
            int choice = user.menu();
            user.doOperation(choice, bookList);
        }

    }
}