Java实现简易的图书管理系统（只有后端）

实现本系统的初衷是为了加深我对java语法的一些理解和练习，所以只实现了几个简单的操作。

本系统共分为两个角色，分别为用户和管理员，都只能进行最基本图书操作。

共四个文件：（1）User：记录用户操作的一些方法；（2）Manager：记录管理员操作的一些方法；（3）Book：定义了每本书的结构；（4）BookList：存储所有书籍信息；

1、Book类

public class Book {
    // 用来表示一本书的信息
    private String name;
    private String author;
    private double price;
    private String type;
    private boolean isBorrowed = false;

    Book(String name, String author, double price, String type, boolean isBorrowed) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
        this.isBorrowed = isBorrowed;
    }

    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 double getPrice() {
        return price;
    }
    public void setPrice(double 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=" + isBorrowed +
                '}';
    }
}

2、BookList类

public class BookList {
    // 书籍列表
    private Book[] books = new Book[100];
    private int size = 0;
    public BookList(){
        books[0] = new Book("水浒传", "施耐庵", 25, "文学", false);
        books[1] = new Book("红楼梦", "曹雪芹", 30, "文学", false);
        books[2] = new Book("三国演义", "罗贯中", 28, "文学", false);
        books[3] = new Book("西游记", "吴承恩", 35, "文学", false);
        books[4] = new Book("数据结构", "严蔚敏", 35, "计算机", false);
    }

    public Book getBooks(int index) {
        return books[index];
    }
    public void setBooks(int index, Book book) {
        books[index] = book;
    }
    public int getSize() {
        return size;
    }
    public void setSize(int size) {
        this.size = size;
    }

    public void deleteBook(int index){
        for(int i = index; i < size-1; i++){
            books[i] = books[i+1];
        }
        size--;
    }
}

3、User类

import java.util.Scanner;
public class User {
    // 普通用户
//    private String name;
//        ----- 1.查阅书籍信息 -----
//        -----   2.借阅书籍   -----
//        -----   3.归还书籍   -----
//        -----   0.退出程序   -----
    public void inquireBook(BookList bookList) {
        System.out.println("请输入要查询书籍的名字！");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.next();
        int result = inquire(bookList, bookName);
        if(result >= 0){
            System.out.println(bookList.getBooks(result));
        }else{
            System.out.println("查询的书籍不存在！");
        }
    }

    public void borrowBook(BookList bookList) {
        System.out.print("请输入想要借阅书籍的名字：>> ");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.next();
        int result = inquire(bookList, bookName);
        if(result >= 0)
            bookList.getBooks(result).setBorrowed(true);
        else
            System.out.println("抱歉借阅的书籍不存在！");
    }

    public void returnBook(BookList bookList) {
        // 归还书籍
        System.out.print("请输入想要归还书籍的名字：>> ");
        Scanner scanner = new Scanner(System.in);
        String BookName = scanner.next();
        int result = inquire(bookList, BookName);
        if(result >= 0)
            bookList.getBooks(result).setBorrowed(false);
        else
            System.out.println("抱歉，归还的书名不存在!");
    }

    public int inquire(BookList bookList, String name){
        int result = -1;
        for(int i = 0; i < bookList.getSize(); i++){
            if(name.equals(bookList.getBooks(i).getName())){
                result = i;
                break;
            }
        }
        return result;
    }
}

4、Manager类

import java.util.Scanner;
public class Manager {

//            ----- 1.查阅书籍信息 -----
//            ----- 2.增加书籍信息 -----
//            ----- 3.删除书籍信息 -----
//            ----- 4.查看书籍列表 -----
//            -----   0.退出程序   -----

    public void look(BookList bookList) {
        // 查看书籍列表
        for(int i = 0; i < bookList.getSize(); i++){
            System.out.println(bookList.getBooks(i));
        }
    }

    public void inquireBook(BookList bookList) {
        // 查询书籍信息
        System.out.println("请输入要查询书籍的名字！");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.next();
        for(int i = 0; i < bookList.getSize(); i++){
            if(bookName.equals(bookList.getBooks(i).getName())){
                System.out.println(bookList.getBooks(i));
                return;
            }
        }
        System.out.println("查询的书籍不存在！");
    }

    public void addBook(BookList bookList) {
        System.out.println("请按照 书籍名 作者 价格 类型 的顺序输入增加书籍的信息！");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.next();
        String author = scanner.next();
        double price = scanner.nextDouble();
        String type = scanner.next();
        Book book = new Book(name, author, price, type,false);
        bookList.setBooks(bookList.getSize(), book);
        bookList.setSize(bookList.getSize()+1);
    }

    public void deleteBook(BookList bookList) {
        System.out.print("请输入想要删除书籍的名字：>> ");
        Scanner scanner = new Scanner(System.in);
        String bookName = scanner.next();
        for(int i = 0; i < bookList.getSize(); i++){
            if(bookName.equals(bookList.getBooks(i).getName())){
                bookList.deleteBook(i);
                break;
            }
        }
    }
}