目录

• 一.Main函数
• 二.用户类
• 三.普通用户类
• 四.管理员类
• 五.图书类
• 六.书架类
• 七.操作类
• • 1.操作接口
  • 2.增加操作
  • 3.删除操作
  • 4.查找操作
  • 5.展示操作
  • 6.借阅操作
  • 7.归还操作
  • 8.退出系统
  • 总结

    这篇图书管理系统是对JavaSE知识总结复习的一个小作业，检测自己对知识的掌握程度。

    一.Main函数

    public class Main {
        public static User login(){
            System.out.println("输入你的姓名：");
            Scanner scanner = new Scanner(System.in);
            String name = scanner.nextLine();
            System.out.println("1.管理员 2.普通用户");
            System.out.println("输入你的身份");
            int choice = scanner.nextInt();
            if (choice == 1){
                return new Admin(name);
            }else
            {
                return new NormalUser(name);
            }
        }
        public static void main(String[] args) {
            BookList bookList  = new BookList();
            User user = login();
            while (true){
                int choice = user.menu();
                user.doOperation(choice,bookList);
            }
        }
    }
    

    二.用户类

    public abstract class User {
        private String name;
        protected IOperation[] iOperations;
        public User(String name){
            this.name = name;
            IOperation[] iOperations;
        }
        public abstract int menu();
        public void doOperation(int choice,BookList bookList){
            IOperation iOperation = iOperations[choice];
            iOperation.work(bookList);
        }
    }
    

    三.普通用户类

    public class NormalUser extends User{
        public NormalUser(String name) {
            super(name);
            this.iOperations =new IOperation[]{
                    new ExitOperation(),
                    new FindOperation(),
                    new BorrowOperation(),
                    new ReturnOperation()
            };
        }
        @Override
        public int menu() {
            System.out.println("*******管理员菜单*********");
            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;
        }
    }
    

    四.管理员类

    public class Admin extends User{
        public Admin(String name) {
            super(name);
            this.iOperations =new IOperation[] {
                    new ExitOperation(),
                    new FindOperation(),
                    new AddOperation(),
                    new DeleOperation(),
                    new ShouwOperation()
            };
        }
        @Override
        public int menu() {
            System.out.println("*******管理员菜单*********");
            System.out.println("*******1.查找图书*********");
            System.out.println("*******2.增加图书*********");
            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;
        }
    }
    

    五.图书类

    public class Book{
        //书名 作者 价格 类型 是否借出
        private String name;
        private String author;
        private int price;
        private String type;
        private Boolean isBorrowed = false;
        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 getBorrowed() {
            return isBorrowed;
        }
        public void setBorrowed(Boolean borrowed) {
            isBorrowed = borrowed;
        }
        public Book(String name, String author, int price, String type) {
            this.name = name;
            this.author = author;
            this.price = price;
            this.type = type;
        }
        @Override
        public String toString() {
            return "Book{" +
                    "name='" + name + '\'' +
                    ", author='" + author + '\'' +
                    ", price=" + price +
                    ", type='" + type + '\'' +
                    ", isBorrowed=" + isBorrowed +
                    '}';
        }
    }
    

    六.书架类

    public class BookList {
        public Book[] books;
        public int usedSize;
        public BookList(){
            this.books = new Book[10];
            books[0] = new Book("三国演义","罗贯中",46,"小说");
            books[1] = new Book("水浒传","施耐庵",37,"小说");
            books[2] = new Book("红楼梦","曹雪芹",76,"小说");
            books[3] = new Book("西游记","吴承恩",88,"小说");
            usedSize = 4;
        }
        public Book getBook(int pos) {
            return books[pos];
        }
        public void setBook(Book book,int pos) {
            this.books[pos] = book;
        }
        public int getUsedSize() {
            return usedSize;
        }
        public void setUsedSize(int usedSize) {
            this.usedSize = usedSize;
        }
    }
    

    七.操作类

    1.操作接口

    public interface IOperation {
        void work(BookList bookList);
        Scanner scanner = new Scanner(System.in);
    }
    

    2.增加操作

    public class AddOperation implements IOperation{
        @Override
        public void work(BookList bookList) {
            System.out.println("请输入你要增加图书的书名");
            String name = scanner.nextLine();
            System.out.println("请输入你要添加书的作者");
            String author = scanner.nextLine();
            System.out.println("请输入你要添加书的价格");
            int price = scanner.nextInt();
            System.out.println("请输入你要添加书的类型");
            scanner.nextLine();
            String type = scanner.nextLine();
            int currentSize = bookList.getUsedSize();
            for (int i = 0; i < currentSize; i++) {
                if(bookList.getBook(i).getName().equals(name)){
                    System.out.println("该书已经存在，无法添加！");
                    return;
                }
            }
            //书不存在 进行添加操作
            Book book = new Book(name,author,price,type);
            bookList.setBook(book,currentSize);
            bookList.setUsedSize(currentSize+1);
        }
    }
    

    3.删除操作

    public class DeleOperation implements IOperation{
        @Override
        public void work(BookList bookList) {
            System.out.println("请输入你要删除书的书名：");
            String name = scanner.nextLine();
            int index = -1;
            int i =0;
            int currentSize = bookList.getUsedSize();
            for ( i = 0; i < currentSize; i++) {
                Book book = bookList.getBook(i);
                if (book.getName().equals(name)){
                    index = i;
                    break;
                }
            }
           if (i >= currentSize){
               System.out.println("要删除的书不存在！");
               return;
           }
            for (int j = index; j < currentSize-1; j++) {
                Book book = bookList.getBook(j+1);
                bookList.setBook(book,j);
            }
            bookList.setBook(null,currentSize);
            bookList.setUsedSize(currentSize-1);
            System.out.println("删除成功！！！");
        }
    }
    

    4.查找操作

    public class FindOperation implements IOperation{
        @Override
        public void work(BookList bookList) {
            System.out.println("请输入你要查找的书的书名：");
            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)){
                    System.out.println(book);
                    return;
                }
            }
            System.out.println("图书馆没有你要寻找的书！");
        }
    }
    

    5.展示操作

    public class ShouwOperation implements IOperation{
        @Override
        public void work(BookList bookList) {
            System.out.println("展示所有图书！");
            int currentSize = bookList.getUsedSize();
            for (int i = 0; i < currentSize; i++) {
                Book book = bookList.getBook(i);
                System.out.println(book);
            }
        }
    }
    

    6.借阅操作

    public class BorrowOperation implements IOperation{
        @Override
        public void work(BookList bookList) {
            System.out.println("图书馆的书如下：");
            int currentSzie = bookList.getUsedSize();
            for (int i = 0; i < currentSzie; i++) {
                Book book = bookList.getBook(i);
                System.out.println(book.getName());
            }
            System.out.println("请输入你要外借的图书的书名：");
            String name = scanner.nextLine();
            for (int i = 0; i < currentSzie; i++) {
                Book book = bookList.getBook(i);
                if(book.getName().equals(name)){
                    if (book.getBorrowed()){
                        System.out.println("该书已被借出，换本书吧！");
                        return;
                    }else {
                        book.setBorrowed(true);
                        System.out.println("借阅成功");
                        System.out.println("该书的信息如下");
                        System.out.println(book);
                        return;
                    }
                }
            }
                System.out.println("你想借阅的图书不存在！");
        }
    }
    

    7.归还操作

    public class ReturnOperation implements IOperation{
        @Override
        public void work(BookList bookList) {
            System.out.println("归还图书");
            System.out.println("请输入你要归还的图书的书名");
            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！");
                    return;
                }
            }
            System.out.println("不存在你要归还的图书！");
        }
    }
    

    8.退出系统

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

    总结

    以上就是图书管理系统的所有知识，有些地方还是需要思考去巧妙地设计使得文章更加简洁明了。冰冻三尺，非一日之寒。水滴石穿，非一日之功。坚持把每一个知识点搞清楚，并进行总结，形成属于自己的知识框架，会让你的学习更加轻松。

     
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