按照实体类创建规范创建图书类Book，包含四个属性（编号、书名、作者、价格）、无参构造器、有参构造器、重写toString方法，并在测试类中创建一个Book对象并将该对象存储到文件中（序列化）代码

以下是示例代码：

import java.io.*;

class Book implements Serializable {
    private int id;
    private String name;
    private String author;
    private double price;

    public Book() {}

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

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                '}';
    }
}

public class Main {
    public static void main(String[] args) {
        Book book = new Book(1, "Java编程思想", "Bruce Eckel", 99.0);

        try {
            FileOutputStream fos = new FileOutputStream("book.ser");
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(book);
            oos.close();
            fos.close();
            System.out.println("Book object has been serialized");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

注意：这里的代码只是示例，实际开发中需要根据具体需求进行修改和完善。