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）并写出代码

### 回答1：
好的，我可以回答这个问题。

以下是创建图书类Book的代码：

import java.io.Serializable;

public 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 +
                '}';
    }
}

以下是测试类中创建Book对象并将该对象存储到文件中的代码：

import java.io.*;

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

        try {
            ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("book.dat"));
            oos.writeObject(book);
            oos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

以上就是创建图书类Book并将该对象存储到文件中的代码。

### 回答2：
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）并写出代码。

下面是图书类Book的代码实现：

import java.io.Serializable;

public class Book implements Serializable {
    private int id;
    private String title;
    private String author;
    private double price;
    
    public Book() {
    }
    
    public Book(int id, String title, String author, double price) {
        this.id = id;
        this.title = title;
        this.author = author;
        this.price = price;
    }
    
    // Getter and Setter methods
    
    public int getId() {
        return id;
    }
    
    public void setId(int id) {
        this.id = id;
    }
    
    public String getTitle() {
        return title;
    }
    
    public void setTitle(String title) {
        this.title = title;
    }
    
    public String getAuthor() {
        return author;
    }
    
    public void setAuthor(String author) {
        this.author = author;
    }
    
    public double getPrice() {
        return price;
    }
    
    public void setPrice(double price) {
        this.price = price;
    }
    
    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", title='" + title + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                '}';
    }
}

下面是测试类的代码实现：

import java.io.FileOutputStream;
import java.io.ObjectOutputStream;

public class Test {
    public static void main(String[] args) {
        // 创建一个Book对象
        Book book = new Book(1, "Java编程思想", "Bruce Eckel", 79.9);
        
        // 序列化并保存到文件
        try {
            FileOutputStream fileOut = new FileOutputStream("book.ser");
            ObjectOutputStream objectOut = new ObjectOutputStream(fileOut);
            objectOut.writeObject(book);
            objectOut.close();
            fileOut.close();
            System.out.println("Book对象已序列化并保存到文件book.ser");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

运行测试类中的main方法后，Book对象将被序列化并保存到名为"book.ser"的文件中。

### 回答3：
按照实体类创建规范创建图书类Book可以按照以下方式实现：

import java.io.Serializable;

public class Book implements Serializable {
    private static final long serialVersionUID = 1L; // 序列化版本UID

    private String number; // 编号
    private String title;  // 书名
    private String author; // 作者
    private double price;  // 价格

    public Book() {
        // 无参构造器
    }

    public Book(String number, String title, String author, double price) {
        this.number = number;
        this.title = title;
        this.author = author;
        this.price = price;
    }

    // getter和setter方法省略

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

在测试类中创建一个Book对象并将该对象存储到文件中可以按照以下方式实现：

import java.io.*;

public class Main {
    public static void main(String[] args) {
        Book book = new Book("123", "Java入门", "张三", 49.99);

        try {
            FileOutputStream fileOutputStream = new FileOutputStream("book.ser");
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);

            objectOutputStream.writeObject(book);
            objectOutputStream.close();
            fileOutputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

以上代码创建了一个Book对象并将其存储到名为"book.ser"的文件中，实现了序列化。