写一个java项目基于面向对象编程，基于控制台的购书系统，实现购书功能。程序运行输出所有图书的信息，包括书的编号，书名，单价，库存。 顾客购书时，根据提示输入图书编号选购需要的书，并根据提示输入需要购买书的数量，购买完毕输出顾客的订单信息，包括订单号，订单明细，订单总额。

在Java中创建一个简单的购书系统，我们可以设计如下的类结构：

1. **Book** 类：

public class Book {
    private int id;
    private String title;
    private double price;
    private int stock;

    // 构造函数、getter和setter
    public Book(int id, String title, double price, int stock) {
        this.id = id;
        this.title = title;
        this.price = price;
        this.stock = stock;
    }

    // 显示书籍信息的方法
    public void display() {
        System.out.println("ID: " + id + ", Title: " + title + ", Price: " + price + ", Stock: " + stock);
    }
}

2. **Catalog** 类（库存管理类）：

import java.util.ArrayList;

public class Catalog {
    private ArrayList<Book> books;

    public Catalog() {
        books = new ArrayList<>();
        // 添加一些示例书籍
        addBook(new Book(1, "Book1", 10.99, 5));
        addBook(new Book(2, "Book2", 15.99, 3));
    }

    // 其他方法如添加书籍、删除书籍等

    // 添加书籍的方法
    public void addBook(Book book) {
        books.add(book);
    }

    // 显示所有书籍信息的方法
    public void displayAllBooks() {
        for (Book book : books) {
            book.display();
        }
    }
}

3. **Customer** 类：

public class Customer {
    private int orderId;

    // 购买方法
    public void purchase(Book book, int quantity) {
        if (book.stock >= quantity) {
            book.decreaseStock(quantity);
            System.out.println("Order ID: " + orderId++ + ", Order Detail: " + book.getTitle() + " x " + quantity + ", Total: $" + quantity * book.getPrice());
        } else {
            System.out.println("Not enough stock for this book.");
        }
    }

    // 减少库存的方法
    public static void decreaseStock(Book book, int decreaseBy) {
        book.stock -= decreaseBy;
    }
}

4. **Main** 类：

public class Main {
    public static void main(String[] args) {
        Catalog catalog = new Catalog();
        catalog.displayAllBooks();

        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.print("Enter book ID to buy or 'exit' to quit: ");
            int inputId = scanner.nextInt();
            if (inputId == -1) break;

            Book selectedBook = catalog.searchBookById(inputId);
            if (selectedBook != null) {
                System.out.print("Enter the quantity: ");
                int quantity = scanner.nextInt();
                Customer customer = new Customer();
                customer.purchase(selectedBook, quantity);
            } else {
                System.out.println("Invalid book ID.");
            }
        }
        scanner.close();
    }

    // 搜索书籍的方法
    public static Book searchBookById(Catalog catalog, int id) {
        return catalog.books.stream().filter(book -> book.getId() == id).findFirst().orElse(null);
    }
}