java中编写一个基于控制台的购书系统，实现购书功能

Java中编写一个基于控制台的购书系统，实现购书功能可以分为以下几个步骤：

1. 定义Book类，包括编号、书名、单价、库存等属性，并提供相应的get和set方法。

2. 定义Order类，包括订单号、订单明细、订单总额等属性，并提供相应的get和set方法。

3. 定义购书系统类，包括输出所有图书信息的方法、购买图书的方法、生成订单的方法等。

4. 在购买图书的方法中，根据用户输入的图书编号和数量，判断库存是否充足，如果充足则更新库存信息，并生成订单。

5. 在生成订单的方法中，根据购买的图书信息计算订单总额，并生成订单号和订单明细。

6. 最后输出顾客的订单信息，包括订单号、订单明细、订单总额。

下面是一个简单的示例代码：

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

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

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }
}

public class Order {
    private int orderId;
    private String orderDetail;
    private double orderTotal;

    public Order(int orderId, String orderDetail, double orderTotal) {
        this.orderId = orderId;
        this.orderDetail = orderDetail;
        this.orderTotal = orderTotal;
    }

    public int getOrderId() {
        return orderId;
    }

    public void setOrderId(int orderId) {
        this.orderId = orderId;
    }

    public String getOrderDetail() {
        return orderDetail;
    }

    public void setOrderDetail(String orderDetail) {
        this.orderDetail = orderDetail;
    }

    public double getOrderTotal() {
        return orderTotal;
    }

    public void setOrderTotal(double orderTotal) {
        this.orderTotal = orderTotal;
    }
}

public class BookStore {
    private static Book[] books = {
            new Book(1, "Java编程思想", 79.0, 100),
            new Book(2, "Java核心技术", 89.0, 50),
            new Book(3, "Java并发编程实战", 69.0, 80)
    };

    private static int orderId = 1000;

    public static void main(String[] args) {
        displayBooks();
        buyBook();
    }

    public static void displayBooks() {
        System.out.println("所有图书信息如下：");
        System.out.println("编号\t书名\t单价\t库存");
        for (Book book : books) {
            System.out.println(book.getId() + "\t" + book.getName() + "\t" + book.getPrice() + "\t" + book.getStock());
        }
    }

    public static void buyBook() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要购买的图书编号：");
        int bookId = scanner.nextInt();
        System.out.println("请输入要购买的数量：");
        int quantity = scanner.nextInt();

        Book book = findBookById(bookId);
        if (book == null) {
            System.out.println("该图书不存在！");
            return;
        }

        if (book.getStock() < quantity) {
            System.out.println("库存不足！");
            return;
        }

        book.setStock(book.getStock() - quantity);

        double total = book.getPrice() * quantity;
        String detail = book.getName() + " x " + quantity;
        int id = generateOrderId();

        Order order = new Order(id, detail, total);

        System.out.println("订单信息如下：");
        System.out.println("订单号：" + order.getOrderId());
        System.out.println("订单明细：" + order.getOrderDetail());
        System.out.println("订单总额：" + order.getOrderTotal());
    }

    private static Book findBookById(int id) {
        for (Book book : books) {
            if (book.getId() == id) {
                return book;
            }
        }
        return null;
    }

    private static int generateOrderId() {
        return ++orderId;
    }
}