@TOC

一、功能介绍

此图书管理系统借助IDEA开发工具实现
图书馆系统一共有两种身份的访问：
1.管理员身份:

2.普通用户身份:

我们一共有三个包分别是book,operations,user实现.

二、Main包

main函数主要进行大致流程的进行，图书库的初始化，图书管理系统的登录，以及具体操作的选择，即实施.

import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        //1.先初始化图书库，以及初始化:
        BookList bookList = new BookList();

        //2.登录
        User user = login();//向上转型，User接受管理员或者用户对象

        //3.打印菜单,进行具体操作
        while(true) {
            int choice = user.menu();
            user.doOperation(choice,bookList);
        }
    }
}

登录功能：

 public static User login() {
        System.out.println("请输入你的姓名: ");
        Scanner scanner = new Scanner(System.in);
        String userName = scanner.nextLine();
        System.out.println("请输入你的身份: 1-> 管理员 2-> 用户");
        int choice = scanner.nextInt();
        if(choice == 1) {
            return new AdminUser(userName);
        }else {
            return new NormalUser(userName);
        }
    }

三、User包

因为有两套系统，管理员和普通用户，所以我们将共同属性提取出来一个User抽象类，以达到代码复用

1. User

package user;

import book.BookList;
import operations.IOperation;

public abstract class User {
    protected String name;

    IOperation[] iOperations;
    public User(String name) {
        this.name = name;
    }

    public abstract int menu();

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

2. AdminUser

package user;

import operations.*;

import java.util.Scanner;
public class AdminUser extends User{

    public AdminUser(String name) {
        super(name);
        this.iOperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new AddOperation(),
                new DelOperation(),
                new DisplayOperation()
        };
    }
    public int menu() {
        System.out.println("欢迎: "+name+"来到图书馆");
        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. 退出图书");
        System.out.println("**********************************");
        System.out.println("请输入你的操作: ");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

3. NormalUser

package user;

import operations.*;

import java.util.Scanner;
public class NormalUser extends User{

    public NormalUser(String name) {
        super(name);
        this.iOperations = new IOperation[]{
                new ExitOperation(),
                new FindOperation(),
                new BorrowOperation(),
                new ReturnOperation()
        };
    }

    public int menu() {
        System.out.println("欢迎: "+name+"来到图书馆");
        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. 退出图书");
        System.out.println("**********************************");
        System.out.println("请输入你的操作: ");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }
}

四、book包

我们对book的属性进行书写，以及在BookList种对图书库的书进行初始化.

1. Book

package book;
public class Book {
    private String name;//书名
    private String author;//作者
    private int price;//价格
    private String type;//书的类型
    private boolean isBorrowed;//书默认未借出

    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) ? "该书已借出" : "该书未借出" )+
                '}';
    }
}

2. BookList

package book;
public class BookList {
    public Book[] books = new Book[100];
    public int usedSize;//用来存当前共有多少本书


    /**
     * 事先通过代码块
     *
     * 事先存进去三本书
     */
    {
        books[0] = new Book("java","高斯林",95,"IT");
        books[1] = new Book("C++","姚琳",93,"IT");
        books[2] = new Book("python","马瑟斯",80,"IT");
        this.usedSize = 3;
    }

    public Book getPos(int pos) {
        //获取某一位置的书
        return books[pos];
    }

    public void setBooks(Book book,int pos) {
        //存储一本书 到指定位置
        books[pos] = book;

    }
    public int getUsedSize() {
        return usedSize;
    }

    public void setUsedSize(int usedSize) {
        this.usedSize = usedSize;
    }