Java编写图书管理系统的代码

以下是一个简单的 Java 图书管理系统示例：

1. Book 类：

public class Book {
    private String id;
    private String name;
    private String author;
    private int price;

    public Book(String id, String name, String author, int price) {
        this.id = id;
        this.name = name;
        this.author = author;
        this.price = price;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public String getAuthor() {
        return author;
    }

    public int getPrice() {
        return price;
    }
}

2. BookList 类：

import java.util.ArrayList;

public class BookList {
    private ArrayList<Book> books;

    public BookList() {
        books = new ArrayList<Book>();
    }

    public void add(Book book) {
        books.add(book);
    }

    public void remove(Book book) {
        books.remove(book);
    }

    public ArrayList<Book> searchByName(String name) {
        ArrayList<Book> result = new ArrayList<Book>();
        for (Book book : books) {
            if (book.getName().equals(name)) {
                result.add(book);
            }
        }
        return result;
    }

    public ArrayList<Book> searchByAuthor(String author) {
        ArrayList<Book> result = new ArrayList<Book>();
        for (Book book : books) {
            if (book.getAuthor().equals(author)) {
                result.add(book);
            }
        }
        return result;
    }

    public ArrayList<Book> getAll() {
        return books;
    }
}

3. Library 类：

import java.util.Scanner;

public class Library {
    private BookList bookList;

    public Library() {
        bookList = new BookList();
    }

    public void addBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入书籍编号：");
        String id = scanner.nextLine();
        System.out.print("请输入书籍名称：");
        String name = scanner.nextLine();
        System.out.print("请输入书籍作者：");
        String author = scanner.nextLine();
        System.out.print("请输入书籍价格：");
        int price = scanner.nextInt();
        scanner.nextLine();
        Book book = new Book(id, name, author, price);
        bookList.add(book);
        System.out.println("添加成功！");
    }

    public void removeBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要删除的书籍编号：");
        String id = scanner.nextLine();
        ArrayList<Book> books = bookList.getAll();
        for (Book book : books) {
            if (book.getId().equals(id)) {
                bookList.remove(book);
                System.out.println("删除成功！");
                return;
            }
        }
        System.out.println("没有找到编号为 " + id + " 的书籍！");
    }

    public void searchBookByName() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要查询的书籍名称：");
        String name = scanner.nextLine();
        ArrayList<Book> result = bookList.searchByName(name);
        if (result.size() == 0) {
            System.out.println("没有找到书名为 " + name + " 的书籍！");
        } else {
            System.out.println("查询结果：");
            for (Book book : result) {
                System.out.println(book.getId() + " " + book.getName() + " " + book.getAuthor() + " " + book.getPrice());
            }
        }
    }

    public void searchBookByAuthor() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要查询的书籍作者：");
        String author = scanner.nextLine();
        ArrayList<Book> result = bookList.searchByAuthor(author);
        if (result.size() == 0) {
            System.out.println("没有找到作者为 " + author + " 的书籍！");
        } else {
            System.out.println("查询结果：");
            for (Book book : result) {
                System.out.println(book.getId() + " " + book.getName() + " " + book.getAuthor() + " " + book.getPrice());
            }
        }
    }

    public void printMenu() {
        System.out.println("1. 添加书籍");
        System.out.println("2. 删除书籍");
        System.out.println("3. 按书名查询");
        System.out.println("4. 按作者查询");
        System.out.println("5. 退出系统");
    }

    public void run() {
        Scanner scanner = new Scanner(System.in);
        while (true) {
            printMenu();
            System.out.print("请选择操作：");
            int choice = scanner.nextInt();
            scanner.nextLine();
            switch (choice) {
                case 1:
                    addBook();
                    break;
                case 2:
                    removeBook();
                    break;
                case 3:
                    searchBookByName();
                    break;
                case 4:
                    searchBookByAuthor();
                    break;
                case 5:
                    System.out.println("谢谢使用！");
                    return;
                default:
                    System.out.println("无效操作，请重新选择！");
            }
            System.out.println();
        }
    }
}

4. Main 类：

public class Main {
    public static void main(String[] args) {
        Library library = new Library();
        library.run();
    }
}

运行以上代码后，你可以通过控制台输入来添加、删除、查询图书信息。你可以根据需求修改代码实现你自己的图书管理系统。