Java实现图书管理系统

一、框架

1. 创建类

用户：管理员AdminUser 普通用户NormalUser 继承抽象类User

书：书Book 书架BookList

操作对象：书Book

2. 知识点

主要涉及的知识点：数据类型变量 if for 数组方法类和对象封装继承多态抽象类和接口

3.利用数组放置图书

Test.Java

BookList.java

方法调用

BookList.java

Book.java

4.利用向上转型实现用户身份的选择

User.java

添加图书操作AddIOperation等类实现接口IOperations

IOperations.java

每个功能操作均需重写接口IOperations的work方法--此处以添加操作为例

NormalUser.java

AdminUser.java

Test.java

二、功能的实现------重写Work()方法

1.退出操作ExitOperation

java 复制代码

public class ExitOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("退出系统");
        System.exit(0);
    }
}

2.展示操作ShowOperation

java 复制代码

public class ShowOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("展示书籍");
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            System.out.println(bookList.getBooks()[i].toString());
        }
    }
}

3.查找操作FindOperation

java 复制代码

public class FindOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("查找书籍");
        System.out.println("请输入您要查找的图书名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if(bookList.getBooks()[i].getName().equals(name)) {
                System.out.println(bookList.getBooks()[i].toString());
                return;
            }
        }
        System.out.println("没有这本书");
    }
}

4.借阅操作BorrowOperation

java 复制代码

public class BorrowOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("借阅书籍");
        System.out.println("请输入你要借阅的图书名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if (bookList.getBooks()[i].getName().equals(name)) {
                bookList.getBooks()[i].setBorrowed(true);
                System.out.println("借阅成功");
                return;
            }
        }
        System.out.println("没有找到这本书");
    }
}

5.归还操作ReturnOPeration

java 复制代码

public class ReturnIOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("归还书籍");
        System.out.println("请输入你要归还的图书名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        for (int i = 0; i < bookList.getUsedSize(); i++) {
            if (bookList.getBooks()[i].getName().equals(name)) {
                if(bookList.getBooks()[i].isBorrowed()) {
                    bookList.getBooks()[i].setBorrowed(false);
                    System.out.println("归还成功");
                    return;
                }else {
                    System.out.println("这本书已经归还了，无需再次归还");
                    return;
                }
            }

        }
        System.out.println("没有找到这本书");
    }
}

6.添加功能AddOperation

java 复制代码

public class AddIOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("增添书籍");
        //判满
        int currentSize = bookList.getUsedSize();
        if (currentSize == bookList.getBooks().length) {
            System.out.println("书架已满，添加失败");
            return;
        }
        System.out.println("请输入图书名字：");
        Scanner scanner = new Scanner(System.in);
        String name = scanner.nextLine();
        System.out.println("请输入图书的作者：");
        String author = scanner.nextLine();
        System.out.println("请输入图书的价格：");
        int price = scanner.nextInt();
        scanner.nextLine();
        System.out.println("请输入图书的类型：");
        String type = scanner.nextLine();

        Book newBook = new Book(name,author,price,type);

        //判断书架有没有这本书
        for (int i = 0; i < bookList.getBooks().length; i++) {
            if(newBook.equals(bookList.getBooks()[i])) {
                System.out.println("该书已存在，添加无效");
                return;
            }
        }
        bookList.setBooks(currentSize,newBook);
        bookList.setUsedSize(currentSize+1);
        System.out.println("添加成功");
    }
}

7.删除操作DelOperation

java 复制代码

public class DelOperation implements IOperations{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除书籍");
        System.out.println("请输入您要删除的图书名字");
        Scanner scanner = new Scanner(System.in);
        int pos = -1;
        String name = scanner.nextLine();
        int currentSize = bookList.getUsedSize();
        int i = 0;
        for (; i < currentSize; i++) {
            if(name.equals(bookList.getBooks()[i].getName())) {
                pos = i;
                break;
            }
        }
        if (i == currentSize) {
            System.out.println("没有你想删除的图书");
            return;
        }
        int j = pos;
        for (;j < bookList.getUsedSize()-1; j++) {
            Book book = bookList.getBooks()[j+1];
            bookList.setBooks(j,book);
        }
        bookList.setBooks(j,null);
        bookList.setUsedSize(currentSize-1);
        System.out.println("删除成功");
    }
}